A federal jury in Massachusetts has convicted a former police detective of murdering a pregnant woman and her unborn child in what prosecutors described as a calculated killing designed to silence a victim he had allegedly exploited for years.
Matthew Farwell, who served as a detective with the Stoughton Police Department, was found guilty Tuesday of murdering Sandra Birchmore in her Canton apartment in February 2021. The United States Attorney for Massachusetts confirmed the conviction on charges of murdering a witness or victim and causing the death of an unborn child.
The verdict came after jurors deliberated for several days following more than three weeks of testimony. On Monday, the jury informed the presiding judge they had reached an impasse. The judge instructed them to return the following day to continue their deliberations, and by Tuesday they had reached a unanimous verdict.
According to prosecutors, Farwell killed Birchmore when she became pregnant and threatened to reveal their long-standing relationship. The government presented evidence that Farwell had begun grooming Birchmore when she was merely fifteen years old and he was twenty-seven. The inappropriate relationship continued for years, prosecutors argued, until Birchmore’s pregnancy created what Farwell perceived as an unacceptable threat to his career and reputation.
Investigators determined that Farwell staged the crime scene to make Birchmore’s death appear self-inflicted. She was discovered dead inside her apartment with a strap around her neck. Local authorities initially classified her death as a suicide. However, the medical examiner subsequently revised the official determination, changing the manner of death from suicide to undetermined. That revision proved crucial in the subsequent federal investigation that led to Farwell’s indictment.
The defense maintained throughout the trial that Birchmore took her own life. Farwell’s attorneys acknowledged their client had engaged in an extramarital relationship with Birchmore but insisted he bore no responsibility for her death. They pointed to Birchmore’s documented struggles with mental health issues and previous statements indicating suicidal ideation. A medical expert testifying for the defense challenged the prosecution’s forensic conclusion that Birchmore had been strangled.
The federal conviction represents a significant development in a case that has drawn attention to questions of police misconduct and the abuse of authority. The charges were brought in federal court because prosecutors alleged Farwell killed Birchmore to prevent her from providing information to law enforcement about their relationship, thus satisfying the federal statute covering the murder of witnesses or victims.
The verdict ensures Farwell will face substantial prison time for his crimes. Federal murder convictions carry severe penalties, and the additional charge related to the death of Birchmore’s unborn child further compounds the gravity of his offenses. Sentencing has not yet been scheduled.
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