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Closing arguments expected in trial of ex-cop accused of killing Sandra Birchmore

Defense experts said Birchmore’s autopsy and phone data support suicide, while prosecutors say 38 witnesses showed Farwell strangled her.

  • The defense rested its case Wednesday in the federal murder trial of former Stoughton police officer Matthew Farwell, accused of killing 23-year-old Sandra Birchmore in 2021. Closing arguments are scheduled for Friday.
  • Prosecutors allege Farwell killed the pregnant Birchmore to conceal a years-long sexual relationship that began when she was 15. The defense maintains she died by suicide when he visited to end their affair.
  • Forensic pathologist Dr. Thomas Andrew testified for the defense that Birchmore's death was "absolutely not" homicide, attributing it to hanging. This contradicts prosecution expert Dr. William Smock, who identified injuries consistent with strangulation.
  • Farwell declined to testify Wednesday, informing Judge Denise Casper of his decision in a firm voice. Jurors will not report Thursday, returning Friday for closing arguments and deliberations.
  • The medical examiner initially ruled the 2021 death a suicide but revised it to "undetermined" following a federal investigation. The trial addresses claims that local police previously failed to conduct a thorough probe.
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NBC Boston broke the news in Needham, United States on Wednesday, November 4, 2026.
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