Ex-officer convicted of killing Sandra Birchmore to keep Massachusetts
woman quiet about sex abuse
[November 11, 2026]
By MICHAEL CASEY
BOSTON (AP) — A former police detective was convicted Tuesday of
murdering a pregnant Massachusetts woman, Sandra Birchmore, to keep her
from revealing that he had sexually abused her when she was 15.
Matthew Farwell, 40, was found guilty of strangling Birchmore on Feb. 1,
2021 — 12 days after a tipster called the suburban Boston police
department where he worked and reported that they’d had an improper
relationship. Birchmore, who was 23 when she died, had been in a
tumultuous relationship with the detective, whom she first met while
participating in a Stoughton Police Department youth program as a child.
Prosecutors said Farwell staged the crime scene to make her death look
like a suicide — and that it nearly worked. Massachusetts State Police
investigators quickly concluded that Birchmore killed herself. But the
FBI began looking into the case two years later and concluded it was a
homicide.
Federal prosecutors harshly criticized the initial police investigation
at Farwell’s trial, saying officers didn’t follow leads and closed the
case too quickly.
“Justice requires persistence, not deference, not convenience, and
certainly not the protection of those who wear the badge and misuse
their authority,” Ted Docks, the special agent in charge of the FBI’s
Boston office, said at a news conference after the verdict. “No badge,
no title, no position places anyone above the law.”
Birchmore’s cousin, Ray Cosgrove, said the family was grateful to those
who pursued answers but emphasized that no verdict could bring back
Birchmore or her unborn son.
“Our family knew the person. The public knew the case,” Cosgrove said.
“Sandra mattered before anyone outside her family knew her name.”
Farwell’s lawyers acknowledged that the married detective had an affair
with Birchmore, but said it began when she was 16, making her old enough
to consent under Massachusetts law. They also maintained that he did not
kill her. They argued that Birchmore had threatened suicide before and
that she killed herself after he went to her apartment to break up with
her.
Farwell’s conviction carries a mandatory life sentence.
The nearly monthlong trial — with about 50 witnesses and 500 exhibits —
unfolded in federal court in Boston, partly because local prosecutors
never brought criminal charges.
Massachusetts State Police officers and investigators, some with
personal connections to Farwell, quickly concluded Birchmore’s death was
a suicide after she was found slumped on her apartment floor with a
strap around her neck. One investigator, Assistant U.S. Attorney Brian
Fogarty told jurors, saw nothing suspicious in Birchmore’s apartment and
concluded this was a “troubled girl who killed herself.”
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A photo of Sandra Birchmore is displayed during a Stronger Together
Standout gathering, where the groups Free Karen Read, Justice for
Sandra Birchmore & Justice for Juston Root protested together,
outside of the Norfolk District Attorney's office, Nov. 13, 2024, in
Canton, Mass. (Jessica Rinaldi/The Boston Globe via AP, File)
The state’s medical examiner, relying partly on information from
police, initially ruled Birchmore died by suicide. The office has
since changed the official manner of death to “undetermined.”
The FBI began looking into Birchmore’s death in 2023, partly at the
urging of a former deputy chief at the Stoughton Police Department
who had led an internal affairs investigation into Farwell based on
the tip the department received before Birchmore’s death.
Federal investigators concluded the local probe into her death was
rushed and compromised. Farwell was interviewed for just 15 minutes
in a parking lot, they said. Investigators didn’t take notes,
examine him for injuries or sample his DNA. Police looked at
Farwell’s phone only after he had deleted texts with Birchmore.
The FBI investigation uncovered about 40,000 texts between Farwell
and Birchmore, including some in which they reminisced about having
sex when he was 27 and she was 15 — too young to consent under
Massachusetts law.
The texts also showed how their relationship grew contentious as
Birchmore pressed Farwell to get her pregnant and threatened to tell
his wife about their relationship.
Texts in late 2020, after she was pregnant, showed they argued over
what role, if any, Farwell would play in the child’s life. A
paternity test after Birchmore’s death revealed a different man was
the father.
At trial, a digital forensics expert testified that Birchmore’s
phone stopped moving three minutes before the lobby security camera
recorded Farwell leaving her building on the night of her death.
An expert hired by prosecutors, Dr. William Smock, testified that
Birchmore’s injuries indicated she was strangled with a duffel bag
strap and that she struggled before dying.
A defense expert, Dr. Thomas Andrew, the former chief medical
examiner in New Hampshire, dismissed Smock’s determination that it
was a homicide.
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