A former police officer from Massachusetts has pleaded not guilty to killing a woman he is accused of sexually exploiting when she was underage and staging the death as a suicide. Matthew Farwell was indicted Tuesday on charges he strangled Sandra Birchmore in early 2021 after she told him that she was pregnant and that he was the father. Birchmore was 23 at the time. Farwell worked as an officer for the Stoughton Police Department from 2012 until 2022. An indictment in U.S. District Court says Birchmore began participating in a police explorers program in spring 2010 when she was about 10 years old and continued through 2016.