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FBI Agents Expected on Stand Today in Trial of Matthew Farwell for Death of Sandra Birchmore

Prosecutors say the former Stoughton officer strangled Sandra Birchmore and staged the scene, while defense lawyers argue she died by suicide.

  • On Wednesday, Massachusetts State Police Trooper Matthew Dunne testified in the federal murder trial of former Stoughton Police Detective Matthew Farwell, detailing an unrecorded interview conducted shortly after Sandra Birchmore was found dead on February 4, 2021.
  • Prosecutors allege Farwell killed the 23-year-old Birchmore to hide their long-term sexual relationship, which they claim began when she was 15 and he was 27; Farwell allegedly staged the scene to appear as a suicide.
  • Surveillance footage from February 1, 2021, captured Farwell entering Birchmore's building wearing a mask, a detail witnesses called 'odd' given his public disdain for COVID-19 precautions.
  • Dunne acknowledged making a 'tactical decision' not to take notes during the February 6, 2021, interview to prevent Farwell from 'shutting down,' though prosecutors argue he was staging the scene.
  • The death was initially ruled a suicide, but the medical examiner later changed the manner to 'undetermined' in 2025; trial proceedings continue, with the jury expected to hear from additional witnesses regarding digital evidence.
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NBC Boston broke the news in Needham, United States on Wednesday, October 14, 2026.
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