THE SANDRA BIRCHMORE CASE
BETRAYAL BEHIND THE BADGE
Chapter 8: The Discovery
February 4, 2021 — Canton, Massachusetts
Three days had passed since Sandra Birchmore was last seen alive.
She was twenty-three years old, pregnant, and making plans for the arrival of her baby.
Her family and friends had no idea that she was dead.
At the Sharon Public Schools, however, people were beginning to worry.
Sandra had failed to show up for work. Attempts to contact her had gone unanswered.
Something was wrong.
A request for a welfare check would soon bring police officers to her apartment.
What they discovered would begin an investigation that eventually reached the federal courthouse.
1. The Missing Employee
Sandra worked as an instructional assistant at East Elementary School in Sharon, Massachusetts.
Her coworkers knew about her pregnancy.
She had talked about becoming a mother and had shared her excitement about the baby.
When she failed to appear for work, her absence raised concerns.
On February 4, school personnel contacted law enforcement to request that someone check on her.
The request eventually reached the Canton Police Department, where Sandra lived.
At approximately 10:55 a.m., officers arrived at her apartment building.
Her vehicle was still in the parking lot.
It was covered with snow and had apparently not moved since the snowfall earlier that week.
The officers approached her apartment.
Nobody answered.
2. The Welfare Check
The apartment was locked.
Officers spoke with the property manager, who provided access to the residence.
They entered.
Inside the bedroom, they discovered Sandra.
She was seated on the floor in a reclined position.
A strap was around her neck and attached to a bedroom closet door handle.
Her cell phone was on the floor near her body.
A paramedic subsequently determined that she was deceased.
Sandra Birchmore was gone.
She had been dead for approximately three days.
The officers initially believed they were dealing with a suicide.
But the circumstances surrounding her death would eventually become the subject of intense scrutiny.
The official Canton Police Department audit later documented the initial response and the discovery of Sandra's body. Canton, MA
3. The Apartment
Investigators began documenting the scene.
There were several details that would become important later.
Sandra's body was positioned near the bedroom closet.
The strap was connected to the closet door handle.
Her phone was nearby.
Investigators also documented items connected to her pregnancy.
In the kitchenette, officers found an ultrasound photograph bearing Sandra's identifying information.
The apartment contained evidence of a young woman preparing for motherhood.
There were baby-related purchases and personal belongings.
Her family would later discover additional items that made the circumstances even more heartbreaking.
Among them was a homemade pregnancy announcement sign.
It included an ultrasound photograph and the words:
"Congratulations, you're going to be a father."
There was also a new baby stroller that had not yet been unpacked.
These were tangible reminders of the future Sandra had been preparing for.
4. The First Responders' Impression
The initial appearance of the scene led officers toward a suicide determination.
There was no immediate indication to the responding officers that a homicide had occurred.
But an initial impression is not the same thing as a completed forensic investigation.
The distinction would become critically important.
The body was transported to the Massachusetts Office of the Chief Medical Examiner.
An autopsy was conducted the following day, February 5.
Investigators would eventually have to determine whether the physical evidence supported suicide, homicide, or another explanation.
5. The Man Who Had Been There
There was another important fact that investigators needed to consider.
Matthew Farwell had visited Sandra's apartment on February 1.
He acknowledged this when questioned by Massachusetts State Police detectives on February 6.
He told investigators that he had gone there to end their relationship.
He also said he wanted to tell Sandra that he was not the father of her unborn baby.
Farwell denied involvement in her death.
But the surveillance footage established that he had been inside the building shortly before Sandra's phone stopped recording movement.
That timeline would eventually become one of the prosecution's strongest pieces of evidence.
6. The Initial Investigation
The investigation was initially handled by local and state authorities.
Detectives interviewed people who knew Sandra.
They examined her relationship with Farwell.
They also began investigating her mental health history.
During the later federal trial, jurors heard about a journal entry Sandra had written in 2017 that contained language resembling a suicide note.
The defense would rely on that material to support its argument that Sandra had died by suicide.
The prosecution, however, argued that the journal entry was years old and did not explain the physical and digital evidence surrounding her death.
There was another important question.
Had investigators adequately examined Farwell's relationship with Sandra?
Had they considered his possible motive?
And had they properly evaluated the possibility that the scene had been staged?
Those questions would become increasingly important as the case developed.
7. May 2021: The Official Determination
In early May 2021, the Massachusetts Office of the Chief Medical Examiner classified Sandra's manner of death as suicide.
The cause of death was recorded as asphyxia by hanging.
For a family already struggling with the loss of a daughter, the official determination was devastating.
But it did not end the questions.
Sandra's family continued to believe that something about the circumstances deserved closer examination.
They wanted someone to look again.
They wanted answers.
And eventually, federal investigators would do exactly that.
END OF CHAPTER 8
NEXT CHAPTER: Chapter 9 — The Suicide Ruling
The next chapter will examine the original medical examiner's determination and the evidence that initially supported the suicide conclusion.
We will explore:
The February 5 autopsy.
The physical evidence involving the strap around Sandra's neck.
The broken necklace and other evidence later scrutinized.
Sandra's 2017 journal entry.
The medical examiner's May 2021 determination.
Why the family continued questioning the official explanation.
The first investigation had reached a conclusion. But had it reached the right one?
Historical distinction: This chapter separates the initial authorities' conclusions from the federal prosecution's later findings. Farwell denied killing Sandra. A federal jury ultimately convicted him of murder in November 2026. cbsnews.com
THE SANDRA BIRCHMORE CASE
BETRAYAL BEHIND THE BADGE
Chapter 9: The Suicide Ruling
February–May 2021 | Canton, Massachusetts
Sandra Birchmore was dead.
Her family had lost a daughter. Her friends had lost someone they cared about. An unborn child had lost the chance to experience life.
But there was another tragedy unfolding.
The circumstances surrounding Sandra's death were being investigated under the assumption that she had taken her own life.
That conclusion would stand for years.
And it would take an FBI investigation, independent forensic examinations, and a federal murder prosecution to challenge the original determination.
1. February 5, 2021: The Autopsy
The day after Sandra's body was discovered, Dr. María Del Mar Capó-Martínez, a pathologist with the Massachusetts Office of the Chief Medical Examiner, performed an autopsy.
Sandra was twenty-three years old.
She was approximately eight to ten weeks pregnant.
The examination documented several significant findings, including:
A fracture of the hyoid bone, a U-shaped bone in the neck.
Petechial hemorrhages in the eyes.
Hemorrhage involving a neck muscle.
Evidence of asphyxia.
These findings would eventually become central to the disagreement between medical experts.
The cause of death was initially determined to be asphyxia by hanging.
The medical examiner would ultimately classify the manner of death as suicide.
But there was an important limitation to the initial investigation.
The medical examiner later testified that she had not received critical investigative information that might have affected her assessment.
2. The Question of Suicide
Investigators examined Sandra's personal history.
They learned that she had experienced mental health difficulties.
Her records included previous emotional struggles and episodes involving suicidal thoughts and self-harm.
The defense would eventually rely heavily on this information during Farwell's federal trial.
There was also a journal entry Sandra had written years earlier.
The entry contained language that the defense would characterize as resembling a suicide note.
Her internet search history also became relevant.
Among the searches discussed at trial were searches involving suicide-related subjects.
The defense argued that these materials demonstrated Sandra had struggled emotionally and that her death was consistent with suicide.
But the prosecution would later challenge the significance of this evidence.
A history of mental health difficulties does not establish how someone died.
And a person's previous thoughts cannot independently determine the circumstances of a death years later.
3. The Evidence That Raised Questions
While the initial investigation focused on suicide, other details would eventually attract considerable attention.
One involved Sandra's necklace.
She frequently wore a gold chain with a small pink flamingo pendant.
After her death, family members discovered the necklace was broken.
There was also a substantial amount of hair caught in the chain.
Another important detail involved the strap used in the apparent hanging.
Federal investigators later examined its position, the buckle, and a patterned injury documented on Sandra's chest.
These details would eventually be examined by independent forensic experts.
The government would argue that they were inconsistent with the original suicide determination.
The defense would dispute those conclusions.
4. The Medical Experts Disagree
The medical evidence became one of the most contested aspects of the case.
Two experts who independently reviewed Sandra's death concluded that homicide was a more likely explanation.
One was Dr. Michael Baden, a prominent forensic pathologist retained by Sandra's estate.
The other was Dr. William Smock, who was retained by federal investigators.
Dr. Smock concluded that Sandra had died from homicidal strangulation.
He identified several findings that he believed supported that conclusion.
The Hyoid Bone
The fracture in Sandra's hyoid bone became particularly important.
Dr. Smock testified that the nature and location of the fracture supported strangulation rather than an ordinary hanging.
The Chest Injury
He also examined a patterned injury on Sandra's upper chest.
He believed the injury was consistent with pressure from the buckle on the strap.
The Broken Necklace
The broken necklace and hair caught in the chain were additional findings he considered consistent with a struggle.
The Injuries to Her Face
Smock also discussed abrasions around Sandra's nose, which he interpreted as potentially consistent with an attempt to breathe during an assault.
The defense challenged the government's interpretation of the medical evidence and presented its own expert testimony.
The competing explanations would eventually be presented to the jury.
5. May 2021: The Official Ruling
In May 2021, the Massachusetts Office of the Chief Medical Examiner officially classified Sandra's death as suicide.
The determination appeared to settle the medical question.
But Sandra's family was not satisfied.
They believed there were unanswered questions.
They wanted investigators to reconsider the evidence.
They wanted someone to examine the possibility that Sandra had been murdered.
The original ruling would remain in place for several years.
Meanwhile, the evidence surrounding Matthew Farwell's relationship with Sandra was becoming increasingly important.
6. What Had the Medical Examiner Been Told?
One of the most significant developments during the federal trial came when Dr. Capó-Martínez testified about the information she had received before making her original determination.
She explained that she had relied on investigative information identifying the death as a suicide.
She had not been given several important details that emerged during the subsequent investigation.
These included:
Farwell's visit to Sandra's apartment on February 1.
The extensive communications between Sandra and Farwell.
The history of their sexual relationship.
The digital evidence concerning Sandra's phone activity.
Information concerning the broken necklace.
Additional forensic findings involving the strap.
The prosecution argued that the original suicide determination had been made without a complete understanding of the circumstances.
This raised a serious question:
What might the medical examiner have concluded if she had been given all the evidence?
7. April–May 2026: A Significant Change
More than five years after Sandra's death, the Massachusetts Office of the Chief Medical Examiner changed its official determination.
In May 2026, the office amended Sandra's death certificate.
The cause of death was changed from:
Asphyxia by hanging
to:
Asphyxia.
The manner of death was changed from:
Suicide
to:
Undetermined.
This was an important development.
It did not mean that the medical examiner had officially declared Sandra's death a homicide.
Instead, the office acknowledged that the available information no longer supported maintaining the original suicide classification.
The federal prosecution, meanwhile, maintained that Farwell had strangled Sandra and staged her death.
8. The Family's Questions Remained
For Sandra's loved ones, the change was significant.
The original determination had placed their daughter in a category they believed did not reflect what happened.
Now the official death certificate no longer classified her death as suicide.
But there was still a long road ahead.
The family needed answers about the night of February 1.
They needed to understand why Farwell had visited her apartment.
They needed to know what happened during the twenty-nine minutes he was inside.
And they needed someone to explain why the original investigation had not uncovered the evidence that would eventually become central to the federal prosecution.
The FBI investigation would provide another opportunity to examine those questions.
And it would uncover something investigators could not ignore.
Approximately 40,000 text messages.
Thousands of communications documenting a relationship that had begun when Sandra was a teenager.
The messages would become a roadmap to the past.
END OF CHAPTER 9
NEXT CHAPTER: Chapter 10 — The Family Refuses to Give Up
The next chapter will explore the period after the original suicide determination.
We will examine:
Sandra's family's growing concerns.
The independent forensic examinations.
The broken necklace and the significance of the physical evidence.
The questions surrounding the original police investigation.
The involvement of federal authorities.
How the case began moving toward a completely different conclusion.
The official ruling had changed. But Sandra's family still needed justice.
Historical accuracy notes
The distinction between the original findings and later conclusions is important:
2021: The Massachusetts medical examiner initially classified Sandra's death as suicide.
2024: Federal prosecutors charged Matthew Farwell with murder.
2026: The medical examiner amended the death certificate to undetermined.
November 10, 2026: A federal jury convicted Farwell.
Sources: boston25news.com
THE SANDRA BIRCHMORE CASE
BETRAYAL BEHIND THE BADGE
Chapter 10: The Family Refuses to Give Up
2021–2024 | Massachusetts
The official explanation was suicide.
The medical examiner had signed the death certificate. Investigators had completed their initial work. Sandra Birchmore's death appeared to have been classified and closed.
But for Sandra's family, something was terribly wrong.
Sandra had been twenty-three years old. She was pregnant. She had been preparing for motherhood and making plans for her unborn child.
Now she was gone.
And the man who had been the last known person to visit her apartment was a police officer with whom she had shared a complicated, secret relationship.
Her family wanted answers.
They were not prepared to accept that the investigation was over.
1. The Questions That Wouldn't Disappear
As Sandra's loved ones began processing their loss, they were confronted with the official conclusion that she had died by suicide.
But several circumstances continued to raise questions.
Why had Matthew Farwell visited her apartment on the night she died?
Why had their relationship remained secret for so many years?
Why had Farwell initially minimized the history of their relationship when questioned?
And what had happened during the approximately thirty minutes he spent inside Sandra's apartment?
There was also the broken necklace.
Family members had discovered a gold chain with a pink flamingo pendant. The chain was broken, and a large clump of Sandra's hair was caught in it.
This physical evidence would later become significant to independent forensic experts.
The family wanted someone to examine the circumstances again.
2. February 5, 2021: An Internal Investigation Begins
There was another development just one day after Sandra's body was discovered.
Stoughton Police Chief Donna McNamara ordered an internal investigation into the department's interactions with Sandra.
This was significant because the case was no longer just about the circumstances of Sandra's death.
It was also about the conduct of officers who had been connected to her through the department's youth program.
Investigators would eventually examine the conduct of three former Stoughton officers:
Matthew Farwell.
His twin brother, William Farwell.
Robert Devine, a former deputy police chief.
The investigation would uncover allegations of inappropriate relationships and professional misconduct involving Sandra.
The questions were becoming broader.
Had Sandra been exploited by more than one person in an institution she had trusted?
And had the department adequately supervised the officers responsible for mentoring young people?
3. The Farwell Brothers
Matthew Farwell was not the only officer whose relationship with Sandra came under scrutiny.
His twin brother, William Farwell, also became the subject of an internal investigation.
Former deputy chief Robert Devine was investigated as well.
In September 2022, Chief McNamara publicly discussed the results of the department's internal investigation.
The findings identified inappropriate conduct involving the three former officers.
The allegations concerning William Farwell included inappropriate physical encounters and exchanges of explicit messages and photographs.
Devine's conduct was also questioned.
The investigation raised serious concerns about the department's youth program and the supervision of officers.
All three men left the Stoughton Police Department in 2022.
The broader misconduct investigation did not establish that the other two men participated in Sandra's death.
Matthew Farwell, however, would eventually face federal murder charges.
4. December 2022: Sandra's Estate Takes Action
On December 29, 2022, Sandra's estate filed a wrongful-death lawsuit.
The lawsuit alleged that Sandra had been subjected to years of grooming and sexual exploitation.
It also accused the town of Stoughton and its police department of negligence in hiring, retaining, and supervising the officers involved.
The lawsuit named Matthew Farwell, William Farwell, and Robert Devine.
The defendants denied the allegations.
The civil case was important because it brought renewed attention to Sandra's experiences and the department's responsibility for protecting young people.
It also kept questions about her treatment from disappearing from public discussion.
But Sandra's family still needed something more.
They needed an independent examination of her death.
5. The Independent Medical Review
One of the most important developments came when Sandra's estate retained prominent forensic pathologist Dr. Michael Baden.
Baden had extensive experience examining suspicious deaths.
He reviewed the available autopsy information and other evidence.
In June 2024, he concluded that Sandra's death was a homicide rather than a suicide.
His findings directly challenged the original medical examiner's determination.
This was a major turning point.
For more than three years, the official classification had been suicide.
Now an independent forensic expert was saying that the evidence supported a different explanation.
The family had reason to believe that their concerns deserved another look.
6. The FBI Enters the Investigation
By 2023, the FBI had begun examining Sandra's death.
One person who helped bring attention to the case was Brian Holmes, a former deputy chief of the Stoughton Police Department.
Holmes had conducted the department's internal investigation into the officers' relationships with Sandra.
He had concerns about the circumstances surrounding her death and encouraged federal authorities to examine the case.
The FBI began reviewing evidence that had not been adequately pursued during the original investigation.
Agents examined:
Sandra's electronic communications.
Farwell's text messages.
Surveillance footage from the apartment building.
Cellphone activity.
Medical and forensic evidence.
The history of the relationship.
Statements made by Farwell to investigators.
The investigation was no longer limited to the initial assumption of suicide.
Agents were considering whether Sandra had been murdered.
7. Approximately 40,000 Messages
Among the most important discoveries were the approximately 40,000 messages exchanged between Sandra and Farwell.
These communications documented years of contact.
They provided investigators with a timeline of the relationship, including evidence that contradicted Farwell's earlier account of when it began.
The messages also revealed arguments, emotional conflicts, discussions about Sandra's pregnancy, and Farwell's concerns about other people learning about their relationship.
Investigators could now compare what Farwell had told authorities with what he had actually written to Sandra.
The difference was significant.
The digital evidence would eventually become a major part of the federal prosecution.
8. August 28, 2024: The Arrest
After reviewing the evidence, federal authorities took action.
On August 28, 2024, Matthew Farwell was arrested and federally indicted.
The charge alleged that he had killed Sandra to prevent her from revealing information about his sexual abuse of her when she was a minor.
According to the federal indictment, Farwell strangled Sandra inside her apartment on February 1, 2021, and staged the scene to make her death appear to be suicide.
Farwell pleaded not guilty.
His defense would maintain that Sandra had taken her own life.
For Sandra's family, however, the federal indictment represented something they had been fighting for years to obtain:
A serious criminal investigation into the possibility that their daughter had been murdered.
The case was finally moving toward a courtroom.
END OF CHAPTER 10
NEXT: Chapter 11 — The FBI Reopens the Case
The next chapter will take a closer look at the federal investigation and the evidence that transformed the case.
We will examine:
Brian Holmes and his concerns about the original investigation.
The FBI's examination of the original police work.
The recovery of Sandra and Farwell's electronic communications.
The surveillance footage from February 1.
The forensic examination of Sandra's necklace and the ligature.
The competing medical opinions.
How federal investigators assembled a murder case.
The original investigation had called it suicide. The FBI was now investigating murder.
Historical sources
U.S. Department of Justice — Federal Indictment and Investigation
Boston Globe — What Investigators Missed in Sandra Birchmore's Death
This chapter distinguishes allegations in the civil lawsuit, findings of the internal investigation, and evidence gathered by federal investigators. They are not interchangeable.
THE SANDRA BIRCHMORE CASE
BETRAYAL BEHIND THE BADGE
Chapter 11: The FBI Reopens the Case
2023–2024 | Massachusetts
For more than two years, Sandra Birchmore's death had carried an official classification that her family believed was wrong.
The original investigation had concluded suicide.
But questions remained about Matthew Farwell, the former Stoughton police detective who had visited Sandra's apartment on the night she died.
There were questions about the history of their relationship, the conflicting statements he had made, and the physical evidence discovered after Sandra's death.
Now the Federal Bureau of Investigation was taking a closer look.
And what investigators began uncovering would transform the case from a questionable death investigation into a federal murder prosecution.
1. The Man Who Wanted Answers
One of the people instrumental in bringing attention to Sandra's case was Brian Holmes, a former deputy chief of the Stoughton Police Department.
Holmes had previously conducted an internal investigation involving the department's relationship with Sandra.
He had become concerned about the circumstances surrounding her death.
He believed the original investigation deserved another examination.
Holmes brought his concerns to federal authorities.
The FBI began investigating whether Farwell had abused his authority as a police officer by sexually exploiting Sandra when she was a minor.
Initially, the investigation focused on possible civil rights violations.
But as agents examined the evidence, another possibility emerged.
Sandra might have been murdered.
2. The Original Investigation Comes Under Scrutiny
Federal investigators began examining how Massachusetts State Police had handled Sandra's death.
They discovered troubling gaps.
One particularly important issue involved Farwell's initial interview.
Investigators had interviewed him for approximately fifteen minutes in a parking lot.
According to evidence presented during the federal trial, the interview was not properly documented.
Investigators had not photographed or examined him for possible injuries.
They had not collected his DNA.
They also had not initially conducted the kind of comprehensive digital investigation that federal agents would later undertake.
Another significant issue involved Farwell's cellphone.
By the time investigators examined it, he had deleted messages involving Sandra.
The FBI would later obtain extensive electronic evidence through additional investigative methods.
The shortcomings of the original investigation became an important part of the federal case.
Why had investigators not pursued these leads more aggressively?
And how much important evidence might have been overlooked?
3. The Digital Investigation
One of the FBI's most important tasks was reconstructing the relationship between Sandra and Farwell.
Agents obtained records from electronic accounts and devices.
They examined information from:
Sandra's cellphone.
Her Apple Watch.
Her iCloud account.
Facebook.
Google.
Farwell's electronic accounts.
Other communications and digital records.
The results were substantial.
Investigators recovered approximately 40,000 text messages exchanged between Sandra and Farwell.
They also recovered a much larger collection of communications from Sandra's electronic devices.
These messages documented years of contact.
They provided investigators with a detailed chronology of the relationship.
Most importantly, they challenged Farwell's earlier account that the sexual relationship had begun only a few years before Sandra died.
The messages contained references to events dating back to 2013.
Sandra had been fifteen.
Farwell had been twenty-seven.
4. The Messages About April 10, 2013
One particular date became especially important.
April 10, 2013.
During the investigation, agents discovered messages in which Sandra and Farwell reminisced about the beginning of their sexual relationship.
Sandra referred to that date as a significant event.
The communications contradicted Farwell's earlier statements about when the relationship began.
The prosecution would eventually use these messages to establish that the relationship began when Sandra was a minor.
This was important for another reason.
The federal government needed to establish why Farwell would have been concerned about Sandra revealing their history.
The messages provided evidence of a relationship that had begun years before his previous account suggested.
They also documented discussions about secrecy and the consequences of their relationship becoming known.
5. The January 20 Telephone Call
Investigators returned to the telephone call made to the Stoughton Police Department twelve days before Sandra's death.
They interviewed dispatcher James Fitton.
Fitton explained what had happened when the woman contacted the department.
He described informing Farwell about the call and witnessing his angry reaction.
This testimony helped establish that Farwell knew someone outside their relationship was discussing it with law enforcement.
The FBI also examined the messages Farwell sent Sandra afterward.
The government believed these communications demonstrated his growing concern about exposure.
The timing was significant.
January 20.
February 1.
Twelve days separated the telephone call from Sandra's death.
6. Reconstructing February 1
The FBI also examined the apartment building's surveillance footage.
Agents compared the video with information extracted from Sandra's phone.
They established that Farwell entered the building at approximately 9:14 p.m.
He left approximately twenty-nine minutes later.
The digital evidence showed that Sandra's phone recorded its final movement at approximately 9:40 p.m.
That was approximately three minutes before Farwell left the building.
Investigators also examined the circumstances surrounding the phone's final activity.
The prosecution would eventually argue that the timing supported its reconstruction of Sandra's final moments.
The defense would challenge the conclusions drawn from that evidence.
But the digital timeline became one of the most important elements of the case.
7. The Forensic Reexamination
The FBI also needed to revisit the medical evidence.
Investigators consulted forensic experts who examined the original autopsy findings.
Among the evidence they considered were:
The fracture of Sandra's hyoid bone.
Injuries involving her neck.
The broken necklace.
The hair caught in the necklace.
The patterned injury on her chest.
The strap found around her neck.
The position in which her body was discovered.
Dr. William Smock, a forensic medical expert retained by federal investigators, concluded that Sandra had died from homicidal strangulation.
He believed the evidence indicated that a duffel bag strap had been used to strangle her.
He also concluded that the scene had been staged to resemble a suicide.
The defense would later present a different medical interpretation.
But the federal investigators now had an expert supporting the possibility that Sandra had been murdered.
8. Approximately 130 Interviews
The investigation expanded considerably.
FBI Special Agent Heidi Kelsch would later testify that approximately 130 people had been interviewed during the federal investigation.
Investigators spoke with people who knew Sandra, people connected to the Stoughton Police Department, and individuals who could provide information about Farwell.
They examined her employment history, medical records, relationships, and personal communications.
They also investigated the department's relationship with the Explorers Program.
The investigation was no longer simply about what happened inside Sandra's apartment.
It was about the years leading up to that night.
The FBI wanted to understand the relationship, the alleged exploitation, the growing conflict, and the events that preceded Sandra's death.
9. August 28, 2024: The Federal Charges
After reviewing the evidence, federal prosecutors moved forward.
On August 28, 2024, Matthew Farwell was federally indicted.
The government alleged that he had strangled Sandra on February 1, 2021, and staged her death as a suicide.
Prosecutors argued that he killed her to prevent her from revealing his sexual exploitation of her when she was fifteen.
Farwell pleaded not guilty.
His defense rejected the murder allegation and maintained that Sandra had died by suicide.
But the case was now moving toward trial.
For the first time, the evidence would be examined in a federal courtroom, where prosecutors would have to prove their allegations beyond a reasonable doubt.
END OF CHAPTER 11
NEXT CHAPTER: Chapter 12 — The Evidence They Almost Missed
The next chapter will examine the evidence that became central to the federal prosecution.
We will explore:
The approximately 40,000 recovered messages.
Farwell's deleted communications.
The surveillance footage from Sandra's apartment building.
The final activity recorded by Sandra's cellphone.
The broken necklace and physical evidence.
The forensic experts who challenged the original suicide determination.
The evidence prosecutors believed established a murder.
The FBI had reconstructed the relationship. Now it needed to prove what happened during those final twenty-nine minutes.
Historical basis: FBI Special Agent Heidi Kelsch's federal trial testimony, federal investigative records, Associated Press reporting, and November 2026 trial coverage.
Sources:
Associated Press — Farwell convicted in Sandra Birchmore murder
NBC Boston — Federal investigation and investigative failures
The investigation had uncovered evidence that challenged the original conclusion about Sandra Birchmore’s death. But investigators still faced a difficult question: could they prove what happened inside her apartment on February 1, 2021?
The answer would depend on evidence that had been preserved on phones, recorded by cameras, and documented during the medical examination.
Chapter 12: The Messages That Told a Different Story
By the time federal investigators began examining Sandra Birchmore’s digital history, they were no longer looking at a simple relationship between two adults.
They were examining years of communication between a teenage girl and a police officer who had been in a position of authority over her.
The messages would become some of the most important evidence in the case.
A Digital Record of the Relationship
Investigators recovered an enormous amount of electronic material from Sandra’s devices.
Among the communications were thousands of exchanges between Sandra and former Stoughton police officer Matthew Farwell.
The messages offered investigators a detailed record of their relationship, beginning when Sandra was still a teenager.
One particularly significant date was April 10, 2013.
According to the prosecution’s evidence, the communications established that the sexual relationship began when Sandra was 15 and Farwell was 27.
That distinction was central to the federal case.
Farwell was not simply another young person involved in a complicated romance. He was an adult police officer who had occupied a position of authority in Sandra’s life.
The government argued that the relationship represented sexual exploitation under the authority of his position.
Thousands of Messages—and Years of Secrets
The recovered communications documented the relationship over several years.
Investigators examined messages involving affection, arguments, jealousy, reconciliation, and periods when communication became strained.
The volume of material was substantial.
Some reports described approximately 40,000 messages exchanged between the two. FBI digital evidence testimony also described a much larger collection of communications recovered from Sandra’s devices, including approximately 240,000 communications overall.
The messages gave investigators something the original local investigation had not fully explored: a chronological record of the relationship.
They could examine what Sandra said, what Farwell said, when conversations occurred, and how their communication changed over time.
Investigators also found that Sandra frequently initiated conversations. FBI testimony described a pattern in which she initiated a substantial portion of their exchanges.
But that statistic did not answer the larger question.
A teenager's repeated attempts to communicate with an adult who had groomed or exploited her would not, by themselves, establish that the relationship was equal or consensual.
The prosecution argued that the messages had to be understood in the context of Sandra's age and Farwell's authority.
The Pregnancy Changed Everything
By late 2020, Sandra's relationship with Farwell had become increasingly complicated.
Sandra was pregnant.
She believed Farwell was the father. Evidence presented during the case showed that Farwell initially believed he might be the father as well.
But later DNA testing established that another man, Jason Pickard, was the biological father.
That discovery did not erase the importance of the pregnancy in understanding the events surrounding Sandra's death.
Prosecutors argued that Farwell had reasons to fear what Sandra might reveal about their relationship.
The government’s theory was that he killed her to prevent her from communicating information about his alleged exploitation of her as a minor and other potential federal crimes.
That was the prosecution's theory—not a fact investigators could establish simply by reading a message.
They would need to connect the communications, the timeline, the physical evidence, and Farwell's movements.
January 20: The Warning
One exchange from January 2021 became especially important.
On January 20, a woman who knew Sandra contacted the Stoughton Police Department and raised concerns about an improper relationship involving Sandra and Farwell.
Dispatcher James Fitton received the call.
According to his trial testimony, he informed Farwell about it.
Fitton testified that Farwell became angry and told him not to discuss the matter. The dispatcher also testified about notes connected to the call that were later discarded.
The call mattered because it suggested that the relationship was no longer entirely hidden.
Someone outside the relationship had raised concerns with the department.
Farwell subsequently communicated with Sandra about the woman who had called.
For prosecutors, the incident helped establish that Farwell knew the relationship could be exposed.
It also raised troubling questions about how the department handled the information.
Why had the concern not resulted in a more thorough investigation?
What steps were taken to protect Sandra?
And why was the officer at the center of the complaint allowed to remain in a position where he could influence how the matter was handled?
The Last Night Revisited
Investigators also returned to the electronic and surveillance evidence from February 1, 2021.
Sandra's final outgoing message to Farwell indicated that her apartment door was open.
Surveillance footage showed Farwell entering her building at approximately 9:14 p.m. and leaving around 9:43 p.m.
The phone evidence placed Sandra's final recorded phone movement shortly before Farwell departed.
Those facts established an important timeline.
They did not, standing alone, establish exactly what happened inside the apartment.
That distinction would become crucial at trial.
The prosecution would argue that the timing, together with the physical evidence and the history of the relationship, supported its theory that Farwell killed Sandra and staged the scene.
The defense would challenge that interpretation and maintain that Sandra died by suicide.
What the Messages Could—and Could Not—Prove
Digital evidence can preserve words, timestamps, and patterns of communication.
It cannot independently reveal every thought, motive, or action.
The prosecution believed the messages helped explain why Farwell might have wanted the relationship concealed and why Sandra's pregnancy and the January 20 phone call were significant.
The defense would argue that the messages did not prove murder.
That disagreement would follow the case into federal court.
The digital record had become one of the prosecution's strongest tools, but it was only one part of a much larger case.
Investigators still had to confront the physical evidence from Sandra's apartment.
And they had to answer the question that had divided experts from the beginning:
Was Sandra's death a suicide, or had someone made it look like one?
END OF CHAPTER 12
Coming in Chapter 13: The Physical Evidence. The prosecution's forensic experts would examine the injuries on Sandra's body, the marks on her chest, the broken necklace, and the ligature around her neck. Their conclusions would directly challenge the original suicide ruling—and the defense would have its own experts ready to disagree.
The next chapter will focus on the competing forensic interpretations of Sandra’s injuries and the scene.
Chapter 13 examines the forensic evidence that became one of the most fiercely disputed parts of the trial: the broken bone in Sandra’s neck, the injury on her chest, her broken necklace, and the duffel-bag strap. The prosecution and defense offered sharply different explanations for what those findings meant.
Chapter 13: The Physical Evidence
The apartment had been treated as the scene of a suspected suicide.
Sandra Birchmore was found in her bedroom on February 4, 2021. A duffel-bag strap was around her neck, attached to a closet doorknob. The initial investigation accepted the possibility that she had taken her own life.
But when federal investigators revisited the case, they examined the photographs, autopsy findings, and physical evidence with a different question in mind:
What if the scene had been staged?
That question would bring forensic experts into the center of the investigation—and eventually into a courtroom where their conclusions would collide.
The Broken Bone
One of the most significant findings was a fracture to Sandra’s hyoid bone.
The hyoid is a small, U-shaped bone in the neck. It plays an important role in swallowing and supporting structures in the throat.
The significance of the fracture became a major issue because Sandra was only 23.
Dr. William Smock, a physician and strangulation expert who testified for the prosecution, examined the autopsy evidence and concluded that Sandra had died from homicidal strangulation.
Smock argued that the location of the fracture, Sandra’s age, and the position in which her body was found were inconsistent with the defense’s explanation of a suicide by hanging.
He emphasized that Sandra had been found in a seated or partially supported position, rather than suspended with her entire body weight hanging from the strap.
In his opinion, the injury was evidence of an assault.
The defense did not accept that conclusion.
Two Experts, Two Interpretations
Dr. Thomas Andrew, a forensic pathologist and former chief medical examiner of New Hampshire, testified for Farwell’s defense.
Andrew challenged the prosecution’s interpretation of the hyoid fracture.
He explained that fractures can occur in different circumstances, including certain types of hanging. He also raised the possibility that the fracture could have occurred after Sandra's death.
He pointed to the absence of hemorrhage at the fracture site as a reason to question whether the injury occurred while Sandra was alive.
Andrew did not conclude that the death was definitely a suicide.
His opinion was that the cause of death was hanging and that the manner of death should be classified as undetermined.
The disagreement was important.
Smock believed the injury supported homicide. Andrew believed the available evidence did not allow him to reach that conclusion with certainty.
Jurors had to evaluate both opinions and decide which interpretation best fit the entire body of evidence.
The Mark on Sandra’s Chest
Another piece of evidence attracted considerable attention.
During the autopsy, a patterned injury was documented on Sandra’s upper right chest.
Smock believed the mark corresponded to a metal clasp on the duffel-bag strap found around her neck.
He examined the strap and measured the clasp. He then used a replica and modeling clay to demonstrate how the clasp could produce an impression similar to the one documented on Sandra’s body.
His interpretation was that the clasp had been pressed against her chest while she was alive.
But there was a problem with the position of the strap when Sandra was discovered.
The clasp that Smock believed matched the chest injury was found near the closet doorknob—not against her chest.
Smock argued that this indicated the strap had been positioned differently at some point and that Sandra’s body or the ligature had been moved.
To him, this was evidence of an altered scene.
Andrew disagreed with the certainty of that conclusion. He acknowledged that the injury appeared similar in shape and size to the clasp but said he could only speculate about how it had been made.
He also discussed the possibility that involuntary muscle movements during asphyxiation could have contributed to the injury.
The chest mark became one of the prosecution’s most memorable pieces of forensic evidence, but its interpretation remained disputed.
The Broken Flamingo Necklace
Sandra regularly wore a gold chain with a small pink flamingo pendant.
The necklace was found broken around her neck.
For Smock, the broken chain was significant because he considered it consistent with a struggle.
He also pointed to photographs showing Sandra’s hair tangled in the duffel-bag strap.
Together, he argued, the broken necklace and tangled hair supported the possibility that Sandra had struggled before her death.
There was another troubling detail: the necklace had not been documented as fully as other evidence during the original investigation.
Smock testified that he had seen it in photographs. He also acknowledged that he did not know its current location.
The defense challenged the significance of these findings.
A broken necklace, by itself, could not establish how or when it broke. Hair caught in a strap also required interpretation rather than automatically proving an assault.
The prosecution argued that these details made sense when considered alongside the other injuries and the circumstances of Sandra’s death.
The defense insisted that the government was asking jurors to draw conclusions from evidence that did not conclusively establish homicide.
The Marks on Her Face and Neck
Smock also discussed abrasions around Sandra’s nose.
He testified that such injuries could occur when a person struggling to breathe moves their face against an obstructing surface.
He considered the marks consistent with suffocation.
He also discussed marks on Sandra’s neck that he believed could be consistent with fingernail injuries.
Andrew offered different interpretations of some of these findings. He discussed decomposition and other possible explanations for the marks, challenging the prosecution’s claim that they necessarily indicated a struggle.
The experts were not simply disagreeing about one injury.
They were interpreting the same photographs and medical findings through different professional conclusions.
That distinction mattered because the original medical examiner had initially ruled the death a suicide.
By the time of the federal trial, that examiner had withdrawn the suicide classification and changed the manner of death to undetermined.
She had not changed it to homicide.
The forensic debate therefore remained central to the government's case.
The Strap and the DNA Questions
The duffel-bag strap was also examined for biological evidence.
DNA testing became another part of the broader investigation.
The presence of DNA on an object does not automatically establish when or how it was deposited. That limitation became important during testimony from defense DNA expert Dr. Maher “Max” Nourredine.
He discussed DNA mixtures, possible transfer, contamination, and the limitations of interpreting complex samples.
The prosecution presented the strap as part of the physical evidence supporting its theory of strangulation and staging.
The defense challenged the strength of the conclusions that could be drawn from the biological evidence.
Once again, jurors were left to evaluate not just what was found, but what the findings could reliably prove.
What the Jury Had to Decide
The physical evidence did not exist in isolation.
Jurors had heard about:
Farwell’s relationship with Sandra, which prosecutors said began when she was 15.
Sandra’s pregnancy and her belief that Farwell might be the father.
The January 20, 2021, phone call raising concerns about their relationship.
Farwell’s visit to Sandra’s apartment on February 1.
Surveillance footage showing him entering and leaving the building.
The extensive messages exchanged between them.
The injuries documented during the autopsy.
The prosecution argued that the evidence formed a connected picture: Farwell had a motive to silence Sandra, an opportunity to kill her, and the physical evidence supported a staged suicide.
The defense argued that the government had not eliminated reasonable doubt. It maintained that Sandra died by suicide and that the forensic findings did not prove otherwise.
The jury ultimately rejected Farwell’s defense and found him guilty.
On November 10, 2026, the federal jury convicted him of murdering Sandra Birchmore and causing the death of her unborn child.
The physical evidence had become part of the prosecution’s successful case, but the verdict reflected the jury’s consideration of the entire record—not one injury or one expert’s opinion.
The Question That Remained
For Sandra’s family, the forensic arguments were about more than medical terminology.
They were about whether the truth of her final hours had finally been recognized.
The original suicide ruling had shaped the early investigation. Years later, the federal case presented a different explanation, supported by testimony and evidence that had not been fully considered at the beginning.
But another question remained.
If the evidence had been available—or properly investigated—in 2021, could the truth have emerged sooner?
And what had happened inside the Stoughton Police Department when concerns about Sandra’s relationship with Farwell first surfaced?
END OF CHAPTER 13
Coming in Chapter 14: The Department Under Scrutiny. The investigation turns toward the police department itself: the January 2021 complaint, the officers who knew about Sandra’s relationship with Farwell, and the questions surrounding what supervisors knew—and what they did about it.
The timeline needs to be clearer because several important events happened between Sandra’s death in February 2021 and Matthew Farwell’s federal trial in October 2026. The investigation did not move directly from the original suicide ruling to a murder prosecution. It took several years for the case to be reopened, reviewed, and brought before a federal grand jury.
Here is the corrected chronology to use as a reference for the story.
The Sandra Birchmore Case
Clarified Timeline: From Sandra’s Death to the Start of Trial
2010–2013: How the relationship began
March 2010: Sandra Birchmore, age 12, joins the Stoughton Police Explorers program.
March 2012: Matthew Farwell begins working for the Stoughton Police Department and serves as an instructor in the Explorers program.
2012: Farwell begins communicating with Sandra online.
April 10, 2013: Messages introduced during the investigation identified this as the date Sandra said she first had sex with Farwell. She was 15; he was 27. Prosecutors alleged that the sexual relationship continued into 2021. NBC Boston
2020–February 2021: Pregnancy, disclosure, and death
October 2020: Prosecutors alleged that Sandra and Farwell discussed having a child nd that an agreement involving her silence about their relationship was reached.
December 28, 2020: Sandra told Farwell she was pregnant and believed he was the father.
December 29, 2020: Sandra and Farwell met. Messages introduced later at trial described her as frightened following the encounter.
January 20, 2021: A friend contacted the Stoughton Police Department and reported concerns about the relationship. A department employee informed Farwell.
Late January 2021: Prosecutors alleged Farwell obtained access to Sandra’s apartment and began examining the location.
February 1, 2021: Farwell visited Sandra’s apartment building. Surveillance showed him entering at approximately 9:14 p.m. and leaving at approximately 9:43 p.m. Her phone recorded its final movement at approximately 9:40 p.m.
February 4, 2021: Sandra was found dead in her Canton apartment.
February 5, 2021: The autopsy was performed.
May 2021: The Massachusetts medical examiner formally classified the manner of death as suicide, with the cause recorded as asphyxia by hanging. Birchmore Archive
2022: The department investigation and civil lawsuit
April 1, 2022: Farwell leaves the Stoughton Police Department.
August 29, 2022: The department's internal-affairs investigation is completed, examining allegations involving Farwell, his twin brother William Farwell, and former deputy chief Robert Devine.
September 2022: Details of the internal investigation become public.
December 29, 2022: Sandra's estate files a civil lawsuit against Farwell, William Farwell, Robert Devine, and the Town of Stoughton. The lawsuit raises allegations involving misconduct, negligence, and failures of supervision. These civil allegations are separate from the criminal charges. NBC Boston
2023–2024: The case is reopened
2023: The FBI begins investigating concerns surrounding Sandra's relationship with Farwell and the circumstances of her death.
2024: Independent forensic reviews increasingly challenge the original suicide conclusion.
June 18, 2024: Dr. Michael Baden, retained by Sandra's estate, concludes that her death was a homicide staged to look like a suicide.
August 27, 2024: A federal grand jury indicts Farwell on a charge of killing a witness or victim.
August 28, 2024: Farwell is arrested and appears in federal court. The government presents its allegations in support of detention. BostonGlobe.com
2025: The federal charges expand
October 28, 2025: A federal grand jury returns a superseding indictment adding a second count alleging that Farwell caused the death of Sandra's unborn child.
The case now proceeds toward trial on two federal counts. GovInfo
2026: The final months before trial
January 23, 2026: A federal judge rejects Farwell's request to move the trial out of Massachusetts.
April 30, 2026: The Massachusetts Office of the Chief Medical Examiner changes Sandra's manner of death from suicide to undetermined. Importantly, the medical examiner does not officially change it to homicide.
June 2026: The court addresses disputes over evidence Farwell's defense wants excluded.
October 1, 2026: The judge rejects another attempt to move the trial.
October 6, 2026: Jury selection begins in federal court in Boston. This marks the beginning of the trial proceedings. AOL.com
Three Important Distinctions for Our Story
To keep the chapters accurate, we should remember these distinctions:
1. The original suicide ruling was never the final medical
determination.
In May 2021, the medical examiner
classified Sandra's death as suicide. On April 30, 2026, that
classification was changed to undetermined—not officially homicide.
2. The FBI investigation and the federal prosecution were
separate stages.
The FBI began investigating in 2023. The
federal indictment did not arrive until August 2024.
3. The murder allegations were not proven until the jury
returned its verdict.
Before November 10, 2026, Farwell
was an accused defendant. The prosecution presented its theory, the
defense challenged it, and the jury ultimately found him guilty.
Where the Story Should Go Next
Our existing chapters have reached the forensic evidence. The next chapters should follow this order:
|
Chapter |
Subject |
|---|---|
|
14 |
What the Stoughton Police Department knew |
|
15 |
The internal investigation and its findings |
|
16 |
Sandra's family refuses to accept the original ruling. |
|
17 |
The FBI begins examining the case. |
|
18 |
The independent forensic reviews |
|
19 |
The August 2024 federal indictment |
|
20 |
The second indictment and the unborn child |
|
21 |
The legal battles before trial |
|
22 |
October 6, 2026: Jury selection begins |
One important correction: The federal trial did not begin in 2024. Farwell was indicted and arrested that year. The actual trial began with jury selection on October 6, 2026.
This chronology will give the story a much stronger foundation and prevent events from being placed in the wrong year.
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