A former Stoughton police officer has been accused of killing 23-year-old Sandra Birchmore and her unborn baby in her Canton apartment, then staging her death to look like a suicide. Prosecutors say the alleged killing took place in Birchmore’s home in Canton and that her death was arranged to be mistaken for self-inflicted death. The former officer is facing the accusation in connection with the deaths of both Birchmore and her unborn baby. The case remains at the accusation stage, with the matter proceeding through the legal process.