Boyfriend stabbed pregnant 18-year-old and buried her in yard, MA officials say
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 buried her body in his yard, news outlets reported.
Now Gregory Groom, 22, of Rehoboth, is charged with murder in the death of Kylee Monteiro, according to WCVB. She had been 11 weeks pregnant.
Following Groom’s arrest at his home the evening of Aug. 19, authorities said human remains, likely Monteiro’s, were found at the Rehoboth residence, CBS Boston reported. Rehoboth is about a 45-mile drive southeast from Boston.
Groom appeared in court for an arraignment Aug. 20, according to the outlet, when prosecutors told the courtroom Groom killed Monteiro before sending a text to her sister. In the message, Monteiro wrote: “He threw me on the ground, and pulled my hair and strangled me. My phones at 4 percent and if I die, it was Greg.”
He pleaded not guilty to murder and other charges he is facing in connection with the killing, according to CBS Boston.
Information on Groom’s legal representation was not immediately available Aug. 20.
“Knowing that I lost my sister, and I will never see her again or say anything to her or get the chance to say goodbye or tell her that I love her,” said Kylee Monteiro’s sister, Faith Monteiro, WCVB reported.
Kylee Monteiro went missing Aug. 7, the Rehoboth Police Department said in a news release shared Aug. 11.
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.
At some point afterward, according to the prosecutor, he fatally stabbed her behind a shed outside his home and buried her in his backyard, the outlet reported.
Groom’s grandparents were said to live with him, according to WCVB.
When Groom first reported Kylee Monteiro as missing, he told police he argued with her at his house, then she left, according to the TV station.
Groom has since confessed to repeatedly stabbing her with a kitchen knife, in her neck and chest, Assistant Bristol County District Attorney Jason Mohan said in Taunton District Court, according to the Fall River Herald News.
“The stab wound to her chest actually broke the blade off,” Mohan told the courtroom, the newspaper reported.
In addition to murder, Groom also pleaded not guilty to assault and battery on a pregnant victim, assault and battery on a family or household member, and aggravated witness intimidation, according to the newspaper.
He is due to return to court on Sept. 10, when his probable cause hearing was set, the Fall River Herald News reported.
Faith Monteiro announced the death of her sister in an Aug. 20 Facebook post, in which she thanked law enforcement, the media and members of the public for their support.
A vigil for her sister will be held in Rehoboth on Aug. 23, she shared.
“We will be providing everyone with a candle and we will have a donation box for those who may want to help cover funeral expenses for Kylee and her baby,” Faith Monteiro wrote.
This story was originally published August 20, 2025 at 4:51 PM with the headline "Boyfriend stabbed pregnant 18-year-old and buried her in yard, MA officials say."
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