Gregory Groom, the boyfriend of Kylee Monteiro, a missing 18-year-old pregnant woman, will be charged with murder after police found a body in Rehoboth, Massachusetts, according to investigators.Police arrested Groom Tuesday in connection with Monteiro's disappearance.

Gregory Groom, 22, is accused of killing 18-year-old Kylee Monteiro, who was 12 weeks pregnant and was last seen earlier this month.

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.