Remains were found in the search for Kylee Monteiro on Tuesday in Rehoboth, Massachusetts, and her boyfriend, Gregory Groom, is facing charges.

TAUNTON, Mass. (CNN) - A Massachusetts man charged with murdering his pregnant 18-year-old girlfriend is being held without bail. Twenty-two-year-old Gregory Groom entered a not guilty plea at his arraignment on Wednesday.

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

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

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.

I tried talking with her after that, and she just stopped responding,” the friend, who was not identified, told WCVB 5.