The case against a former Stoughton police officer accused of killing a pregnant woman and staging her death as a suicide is expected in federal court on Tuesday.
Prosecutors allege that Matthew Farwell killed Sandra Birchmore by strangling her on February 1, 2021, and then staging her Canton apartment to make it look like a suicide in an attempt to conceal their sexual relationship, which authorities say began before Birchmore turned 18.
Investigators say Birchmore was pregnant at the time of her death. However, DNA testing later determined the unborn child was not Farwell’s…