According to prosecutors, about two weeks before Sandra Birchmore was found dead, Matthew Farwell told a coworker that the “problem” he was dealing with was going to take care of itself. Prosecutors believe that problem was Sandra — pregnant, consulting attorneys, and increasingly willing to use what she knew about Farwell’s alleged crimes to protect herself and her unborn child.
In April 2026 filings opposing Farwell’s bail request, the prosecution revealed that his DNA was found on the duffel bag strap tied around Birchmore’s neck — the ligature prosecutors call the murder weapon. His sperm cells were found in the underwear she was wearing at the time of death, contradicting his claim to investigators that they were last intimate in 2020. Prosecutors call this a provable lie that demonstrates consciousness of guilt.
The prosecution also dismantled the original state investigation. Within an hour of discovering Birchmore’s body, local officers told the medical examiner there was no foul play. Canton police misidentified the ligature as a scarf. No DNA sample was compelled from Farwell. No electronic devices were seized. Investigators let him keep his cellphone for days. His twin brother William was told no one was in trouble. The case was closed within months. As prosecutors wrote: at no point was Farwell seriously considered a suspect.
Farwell has lost every pre-trial motion — venue change denied, dismissal denied. His defense team’s bail filing accidentally appeared to name William Farwell as the father of Birchmore’s unborn child before being hastily amended. The biological father has not been publicly identified. Birchmore’s family is now seeking a no-contact order after defense investigators visited her cousin’s apartment unannounced.
Trial begins October 5, 2026 in federal court in Boston. If convicted, Farwell faces life. Hidden Killers has the full breakdown.
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