Matthew Farwell and Sandra Birchmore: What the Guilty Verdict Means | Nov. 10, 2026

Verified and updated: November 10, 2026, at 9:06 p.m. UTC (4:06 p.m. EST, Boston).

A federal jury in Boston found former Stoughton police detective Matthew Farwell guilty on November 10 of killing Sandra Birchmore and causing the death of her unborn child. The verdict followed nearly a month of testimony and jury deliberations that began November 6. The murder-related conviction carries a mandatory life sentence, according to the Associated Press’s report on the verdict.

What happened in the Matthew Farwell and Sandra Birchmore case?

Birchmore had participated as a young person in the Stoughton Police Department’s Police Explorers program. Farwell, a department officer, met her through that program. Federal prosecutors alleged that he began sexually abusing her when she was 15 and he was 27, and that their relationship continued as she became an adult. These allegations formed part of the government’s explanation for the federal charge; the jury’s verdict established Farwell’s guilt on the charged counts.

Birchmore was found dead in her apartment in Canton on February 4, 2021. She was 23 and pregnant. The death was initially treated as a suicide. The case changed direction after federal investigators examined it, and a federal grand jury indicted Farwell in 2024. The government alleged that he strangled Birchmore on February 1, 2021, and staged the scene to look like a suicide.

What was Matthew Farwell convicted of?

The jury found Farwell guilty on two counts: killing a witness or victim to prevent communication with law enforcement about a possible federal offense, and causing the death of Birchmore’s unborn child. The first count made the case a federal prosecution: prosecutors had to prove the killing was intended to prevent a report of information about a possible federal crime. The second count was added in a 2025 superseding indictment. The superseding indictment filed by the U.S. Department of Justice describes the charges as allegations; the jury has now returned guilty verdicts.

Prosecutors said Farwell feared Birchmore would reveal the relationship and alleged sexual abuse. The defense disputed the government’s account: lawyers acknowledged an affair but argued it began when Birchmore was 16, and maintained that Farwell did not kill her. They argued she died by suicide. The jury rejected the defense position and convicted him.

What evidence did jurors hear?

The trial included testimony from about 50 witnesses and roughly 500 exhibits, according to the Associated Press. Prosecutors presented text messages, digital and investigative evidence, and expert testimony about Birchmore’s injuries. One prosecution expert said the injuries were consistent with strangulation using a bag strap and that Birchmore struggled. A defense medical expert challenged the homicide conclusion. The competing testimony mattered because jurors had to evaluate both the cause and manner of death as well as the government’s account of Farwell’s actions and intent.

The FBI’s investigation followed the initial state-level conclusion that Birchmore had died by suicide. The Associated Press reported that federal investigators viewed the earlier inquiry as incomplete and that the medical examiner’s office later changed the official manner of death to “undetermined.” That earlier classification is part of the case’s history; it does not undo the jury’s verdict after hearing evidence in federal court.

Why was the trial in federal court?

The main count was based on an alleged effort to prevent communication with law enforcement about possible federal offenses, placing the prosecution under federal law. The Justice Department’s case page for United States v. Matthew Farwell collects federal charging information and filings. The distinction helps explain why the case was tried in the U.S. District Court in Boston even though Birchmore’s death occurred in Massachusetts and Farwell had been a local police officer.

What happens after the verdict?

The conviction resolves the jury trial, but the judge must still impose the sentence. News reports say the murder-related conviction carries a mandatory life sentence. The case also remains important beyond sentencing because it raised questions about how the first investigation handled Birchmore’s death and about the conduct of officers who knew Farwell. Those broader questions are not themselves findings in Farwell’s criminal verdict; any separate reviews or civil proceedings have their own records and standards.

Reporting basis: the November 10 Associated Press verdict report, the U.S. Department of Justice case page, and the 2025 superseding indictment. The jury’s findings are distinguished above from prosecutors’ pretrial allegations and arguments.

Frequently asked questions

Was Matthew Farwell found guilty?

Yes. A federal jury found him guilty on November 10, 2026, of killing Sandra Birchmore and causing the death of her unborn child.

How old was Sandra Birchmore when she died?

Birchmore was 23 when she was found dead in February 2021.

What sentence does Matthew Farwell face?

The murder-related conviction carries a mandatory life sentence. The judge’s sentencing proceeding remains the next formal step.