CANTON, Mass.(TND) — A former detective accused of killing a pregnant Massachusetts woman in 2021 was arrested on Wednesday. FBI officials in Boston said Matthew Farwell was arrested for allegedly killing Sandra Birchmore. Farwell worked for the Stoughton Police Department when 23-year-old Birchmore was found dead in her apartment. A 2022 internal investigation found that three police officers on the Stoughton police force engaged in inappropriate sexual relations with Birchmore, according to WBZ. Federal prosecutors alleged that Farwell had a sexual relationship with Birchmore, which had started before she turned 16. Prosecutors believe Farwell killed the young woman after she...