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

A Massachusetts man told police his pregnant 18-year-old girlfriend was missing in early August but she was already dead, according to prosecutors, who said he stabbed her then bu

Massachusetts police converged in an area where 18-year-old Kylee Monteiro was last seen, almost two weeks after she was reported missing.

Kylee Monteiro went missing in Rehoboth, Massachusettsafter, having “domestic issues” with her boyfriend, and after telling her friend “something’s not right.”

A search is underway in Rehoboth, Massachusetts for a missing pregnant teenager. Kylee Monteiro, 18, has not been seen in almost a week and the fear is growing with each passing day. "She's timid and scared and doesn't know how to be on her own," said her sister Faith Monteiro.

REHOBOTH, Mass. — Friday marks the eighth day that 18-year-old Kylee Monteiro has been missing. Monteiro, who is 11 weeks pregnant, was last seen on Thursday, August 7, at her boyfriend’s home in Rehoboth, Massachusetts, according to family, friends, and law enforcement.

Gregory Groom is accused of killing his pregnant girlfriend, Kylee Monteiro, who texted her sister, "If I die, it was greg" before vanishing.