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.

When Groom was interviewed by police Aug. 19, he said Kylee Monteiro arrived at his house Aug. 6 from a residential program and said she hoped to stay with him, revealing she was pregnant and he was the father, a prosecutor said, according to WLNE.

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.”

Officials in Massachusetts are searching for 18-year-old Kylee Monteiro, who has been missing for over one week, according to the Rehoboth Police Department.

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.

Massachusetts State Police and Rehoboth police continue the search for a missing Rehoboth teenager who was last seen on Thursday.

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.