Gregory Groom, of Rehoboth, confessed to police that he stabbed Kylee Monteiro multiple times with a kitchen knife, according to prosecutors.

Gregory Groom, 22, appeared before a judge in Taunton District Court to answer to charges of murder, aggravated assault and battery on a pregnant person, domestic assault and battery, and intimidation of a witness for acts committed against 18-year-old Kylee Monteiro. A plea of not guilty was entered on his behalf.

Gregory Groom, 22, was charged with aggravated assault and battery on a pregnant person, domestic assault and battery, and intimidation of a witness “for acts committed against” Kylee Monteiro on Aug. 6, Bristol District Attorney Thomas M. Quinn III’s office said.