The former Stoughton police detective accused of killing 23-year-old Sandra Birchmore while she was pregnant now faces an additional charge.

Matthew Farwell. – Stoughton Police Department

Matthew Farwell, 39, was charged with causing the death of a child in utero in a superseding indictment filed Tuesday by a federal grand jury.

Birchmore was carrying a male fetus that was between eight and 10 weeks old at the time of her death, according to the document. This is the first time authorities have identified the gender of Birchmore’s unborn child.

Prosecutors say Farwell groomed Birchmore from the time she was a high school student, committing statutory rape and engaging in a yearslong sexual relationship with her. She became pregnant in late 2020 and told Farwell that he was the fat

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