Boston, Massachusetts - Matthew Farwell, a police officer in Stoughton, Massachusetts, has been convicted on all federal charges over the killing of 23-year-old Sandra Birchmore.

After telling the judge they were deadlocked on Monday, the jury reached a unanimous verdict the following day, finding Farwell guilty of killing a witness and killing an unborn child.

The federal trial centered on the 2021 death of Birchmore, which had first been ruled a suicide.

Prosecutors accused Farwell of fatally strangling Birchmore after she told him she was pregnant following years of sexual abuse that allegedly began when Birchmore was just 15 years old.

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Birchmore first met Farwell when she took part in the Stoughton Police Explorers program at the age of 13, where Farwell became a mentor to her.

Prosecutors said that Farwell abused Birchmore until her death, arguing that the former officer killed Birchmore to prevent her from exposing his crimes.

Acting Chief of Police James O'Connor welcomed the verdict in a statement, calling it "the outcome Sandra, her unborn child, and her family have deserved for more than five years."

"What happened to Sandra is a profound betrayal of the trust every police officer is sworn to uphold," O'Connor added. "Matthew Farwell used his position to harm someone the community had put in the care of this department."

Farwell is scheduled to be sentenced on February 3, 2027.