A former Stoughton police detective accused of killing Sandra Birchmore pleaded not guilty Friday on new charges of allegedly killing her unborn son.

Last month, a federal grand jury indicted Matthew Farwell, 40, on a charge of causing the death of a child in utero in connection with Birchmore’s alleged murder.

Farwell did not appear at the brief arraignment in federal court, according to a Boston Globe report. However, he submitted paperwork entering not guilty pleas to the two-count indictment and waived his right to be present in court.

Federal prosecutors alleged Farwell strangled 23-year-old Birchmore to death in her Canton apartment on Feb. 1, 2021, and arranged the scene to look like a suicide. He has pleaded not guilty to those charges and remains in custody while awa

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