Federal Jury Convicts Ex-Officer in Birchmore Killing

A federal jury in Boston convicted former Massachusetts police officer Matthew Farwell on November 10 of killing Sandra Birchmore and causing the death of her unborn child. The verdict followed a five-week trial over a death initially treated as a suicide, with prosecutors arguing that Farwell killed Birchmore to prevent exposure of his sexual exploitation of her when she was a minor.

Farwell, 41, formerly of the Stoughton Police Department, was found guilty of one count of killing a witness or victim and one count of causing the death of an unborn child. Birchmore was 23 and pregnant when she was found dead in her Canton apartment in February 2021. The jury’s decision rejected the defense position that Farwell had not killed her.

The federal case arose after investigators revisited the original determination about the manner of death. Prosecutors said Birchmore had been strangled and her death staged to look like a hanging. Defense attorneys challenged the government’s reconstruction and argued that the prosecution had not met the burden of proof.

A Relationship That Began in a Police Youth Program

Birchmore met Farwell when she participated in the Stoughton police youth explorers program. He was an instructor, and prosecutors said the relationship developed into sexual exploitation while she was still a teenager. According to the Justice Department’s account of the verdict, the government proved that Farwell feared she would reveal both that exploitation and meetings he had with her while on duty.

The relationship remained a central issue at trial because prosecutors tied their proposed motive to what Birchmore might disclose. Evidence included extensive messages between the two. Reporting on closing arguments described roughly 40,000 text messages and the disputes over what those communications showed about their history and her final months.

Prosecutors also described Birchmore’s pregnancy in connection with Farwell’s concerns about public exposure. During the trial, evidence showed she believed Farwell was the father; subsequent DNA testing established that another man was the biological father. The case concerned the death of Birchmore and her unborn child, not a paternity charge against Farwell.

Phone Records and the Last Night

The prosecution used phone records and building surveillance to establish a timeline of Farwell’s movements near Birchmore’s apartment. Boston-area reporting of the trial described her phone locking for the last time at 9:13 p.m. on the night in question. Video allegedly showed Farwell entering the building’s elevator about a minute later, wearing a mask.

Investigators then identified a small amount of movement recorded by Birchmore’s phone around 9:40 p.m. Video showed Farwell leaving the building minutes later, according to the prosecution timeline. The final government witness, a forensic consultant, walked jurors through the sequence as part of the argument that Farwell was present when Birchmore died.

Farwell’s attorneys contested the conclusions prosecutors drew from that evidence. In closing arguments, the defense disputed the killing allegation and challenged whether the circumstantial evidence proved the government’s case beyond a reasonable doubt. Jurors had to assess the competing explanations together with the medical and forensic testimony.

The trial did not proceed without uncertainty. Reporting from the courthouse indicated that jurors deliberated for nearly two full days and initially struggled to reach unanimity before returning guilty verdicts. Their final decision resolved the trial question on both charged federal counts.

Verdict and Sentencing Date

The Justice Department said U.S. District Court Chief Judge Denise J. Casper scheduled sentencing for February 3, 2027. Farwell was arrested and charged in August 2024, more than three years after Birchmore’s death. The federal prosecution followed investigative work that differed from the initial treatment of the scene.

The guilty verdict establishes Farwell’s criminal responsibility for the two federal offenses. Sentencing remains ahead, along with the possibility of post-trial proceedings or an appeal. For Birchmore’s case, the jury’s finding replaced the original suicide explanation with a federal criminal conviction for her death and that of her unborn child.

References: U.S. Department of Justice: Matthew Farwell convicted | WBUR: Jury finds Farwell guilty | WBUR: Closing arguments detail prosecution and defense | Boston Globe: Closing arguments and phone-record timeline