# Former Massachusetts Detective Convicted of Murdering Pregnant Woman Sandra Birchmore A federal jury found Matthew Farwell guilty of strangling Birchmore to silence their illicit relationship. - **Source:** [The Independent – News](https://www.independent.co.uk/news) - **Published:** 2026-11-10 - **Topic:** [politics](https://brifing.si/c/politics) - **Original article:** - **On Brifing:** https://brifing.si/s/db848279-f0de-4cc0-b34b-06b94ef42557 ## Federal Jury Conviction A federal jury in Boston convicted former Stoughton police detective Matthew Farwell of murdering 23-year-old Sandra Birchmore. Prosecutors argued Farwell strangled Birchmore in February 2021 to prevent her from exposing their long-term sexual relationship. The verdict follows a monthlong trial featuring 50 witnesses and 500 pieces of evidence presented in court. ## Origins of Relationship Farwell and Birchmore first met when she was a 13-year-old participant in a Stoughton Police Department youth program. Prosecutors established that their sexual relationship began when Birchmore was 15, which is below the age of consent in Massachusetts. The pair maintained a contentious connection for years until her death in 2021. ## Initial Suicide Ruling Local investigators initially ruled Birchmore’s death a suicide after finding her body with a strap around her neck. The medical examiner’s office relied on police reports to support this conclusion. However, the official manner of death was later changed to undetermined after federal authorities began a deeper investigation into the case. ## Federal Investigation Findings The FBI intervened in 2023, criticizing the local police probe as rushed and compromised. Investigators noted that Farwell was interviewed for only 15 minutes without proper documentation or DNA sampling. Digital forensics later recovered 40,000 text messages, revealing that Birchmore had threatened to expose their affair to Farwell’s wife before she died. ## Staged Crime Scene Prosecutors presented evidence that Farwell staged the apartment to mimic a suicide. A digital forensics expert testified that Birchmore’s phone stopped moving three minutes before security cameras recorded Farwell leaving the building. Medical experts debated the cause of death, with prosecution witnesses citing physical injuries consistent with strangulation by a strap. ## Defense Arguments Farwell’s legal team acknowledged the affair but maintained it began when Birchmore was 16, asserting it was consensual. They argued Birchmore had a history of mental health struggles and committed suicide after Farwell visited her to end their relationship. A defense expert witness challenged the prosecution’s claim that the death was homicide. ## Pregnancy and Paternity Birchmore was pregnant at the time of her death and believed Farwell was the father. However, a post-mortem paternity test confirmed that a different man was the father of the child. The pregnancy had become a major point of contention in their relationship, with Birchmore pressuring Farwell regarding his future involvement. ## Legal Consequences Farwell was convicted of killing a witness to prevent her from reporting his crimes, alongside causing the death of an unborn child. He now faces a mandatory sentence of life in prison without the possibility of parole. The Department of Justice previously decided against seeking the death penalty for the former officer. ## Sources covering this story - [The Independent – News — Former Massachusetts Detective Convicted of Murdering Pregnant Woman](https://www.independent.co.uk/news/world/americas/crime/matthew-farwell-guilty-sandra-birchmore-murder-b3082719.html) - [CBS News – U.S. — Former Officer Matthew Farwell Convicted in Sandra Birchmore Murder Case](https://www.cbsnews.com/news/matthew-farwell-trial-jury-verdict-sandra-birchmore/) --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._