The former Massachusetts police officer accused of killing Sandra Birchmore after grooming her for years has been charged with a second crime in federal court.

Matthew Farwell , who had already been facing a charge of killing a witness or victim , was also charged on Tuesday with violating a federal law protecting unborn children by causing the death of the child that Birchmore was pregnant with.

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The new indictment filed in U.S. District Court for Massachusetts, includes new details about Birchmore's pregnancy: the child was male, conceived about 8-10 weeks before.

NBC10 Boston has reached out to Farwell's lawyers. The former Stoughton police detective could be sentenced to death if he's convicted — viol

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