Rehoboth teen had rocky relationship with boyfriend in months before her death
- Gregory Groom confessed to killing his girlfriend Kylee Monteiro after an argument behind a shed, stabbing her twice in the neck and once in the chest.
When Gregory Groom and Kylee Monteiro met at an Attleboro park in February, they hit it off.
At the time, Groom told police, he was looking for new friends and struck up a conversation with Monteiro and two of her friends. After the day they met, Groom and Monteiro texted often.
Montiero was in a "tough spot" with her friends and family, and Groom believed she was being abused by a family member, though he told police he later learned that was a lie. The relationship "started off strong," but Groom said he believed Monteiro was manipulative, and he began to drift away from her after a few months.
When Groom attempted to end the relationship, Monteiro told him she was pregnant. Monteiro eventually ran away from home and lived at a shelter in Hanover.
By Aug. 6, she had returned to Groom's home in Rehoboth. A day later, prosecutors say, she was dead and buried in Groom's yard .
Groom is charged not just with killing Monteiro , but also with assault and battery of a pregnant victim, intimidation of a witness, and assault and battery on a family/household member. The assault charges are tied to an incident on Aug. 6, when, police say, Groom shoved Monteiro into a shed door, where she hit her head.
The 22-year-old Groom lived on a sprawling 20-acre property with his brother and grandparents on County Street in Rehoboth and spent much of his time in a shed on the property.
When Monteiro first told Groom she was pregnant, he believed she was lying. There was "no proof and she was constantly lying," Groom told police, Rehoboth Police Detective Paul McGovern wrote in a police report filed in court.
Groom was shocked and didn't know what to do. Eventually, he began saving up so they could live together because Monteiro wasn't allowed to stay at his house.
The relationship continued to devolve, and the pair argued almost daily. Groom denied that those arguments ever got physical, but when pressed by police, he admitted to grabbing Monteiro's wrist during a fight and knocking her phone out of her hand.
After the fight, which Groom said happened about two months ago, Monteiro went to the shed and took photos of the injuries to her wrist, sending them out via social media. She told her friends Groom was abusing and hitting her.
"She made it out to look like I was abusing her, hitting her," Groom told police, according to the report. "She said I put my knee on her chest so she couldn't breathe. When all I did was grab her arms so she could put the phone down and we could talk."
Groom first reported Monteiro missing on Aug. 8. He told police he had last seen her walking down County Street toward Reservoir Avenue.
The day Monteiro disappeared, Aug. 7, Groom said, the pair spent the day looking for places at which Monteiro could live. At one point a month earlier, the pair had gone to the reservoir to find a place Monteiro could camp near where Groom was living.
During his interview with police, Groom was "silent, fidgety and avoided eye contact." Officers asked him numerous times to get whatever was bothering him off his chest, but Groom only repeated the story about the incident involving the phone.
Gregory Groom of Rehoboth, in Taunton District Court to be arraigned in connection with the murder of Kylee Monteiro on Wednesday, August 20, 2025.Mark Jarret Chavous/The Enterprise
It was during a subsequent interview on Tuesday that Groom was forthcoming about what actually took place between him and Monteiro, according to police. He admitted to pushing her in the shed on Aug. 6, but denied pulling her hair or strangling her as Monteiro claimed in a text to her sister.
"My phones at 4% if I die it was Greg," Monteiro told her sister that day, according to the report.
It was during that interview, police say, that Groom admitted to killing Monteiro. The confession came after police told Groom they had obtained a search warrant for the property.
Groom ultimately drew a "rudimentary map" for police, and admitted that he and Monteiro got into an argument behind the shed where she was staying, a prosecutor said during Groom's arraignment Wednesday.
During the argument, police say Groom told them he stabbed Monteiro twice in the neck and once in the chest.
The blow to the chest broke the blade off the kitchen knife that Groom used, the prosecutor said. Groom then spent several hours digging a hole in the woods roughly 20 yards from where he had killed Monteiro. He pushed her body in the hole when the sun came up, he told police.
During their search of the property on Tuesday, police found a large pile of brush near the shed covering the site of the murder. Under the brush, they found blood and other physical evidence, the prosecutor said.
About 20 yards away, police found another large pile of brush, with "feet upon feet of cut-down trees that were piled up." Underneath that pile, police found a rectangular hole filled with "recently disturbed dirt."
A body consistent with Monteiro was found about 5 feet into that hole. The remains have not yet as of Wednesday been identified as Monteiro's by the Office of the Chief Medical Examiner.
"All of the evidence points to the defendant at this point ... having killed her," Bristol County District Attorney Tom Quinn said.
Quinn extended his sympathies to Monteiro's family and told them to be patient with the court process, "despite the trauma that they are experiencing."
Both Groom and Monteiro's families attended the arraignment, but neither spoke to the media as they left. A person leaving the courtroom with Monterio's family said only, "We're devastated."
More news about Kylee Monteiro's case
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