Boyfriend Sentenced to Life in Prison for Murdering Pregnant Teen Who Warned Sister: “If I Die, It Was Greg”

A 23-year-old Massachusetts man has been sentenced to life in prison after admitting to murdering his 18-year-old pregnant girlfriend and burying her body in a five-foot-deep grave on his family’s property. Gregory Groom pleaded guilty to second-degree murder and witness intimidation in the death of Kylee Monteiro, whose disappearance in August 2025 sparked a search that ultimately uncovered a heartbreaking crime. The case drew particular attention because Kylee had sent her sister a frightening warning shortly before she was killed.

On August 6, 2025, Kylee sent her sister a text message describing an alleged violent confrontation with Groom. She wrote that he had thrown her to the ground, pulled her hair and strangled her. With her phone battery reportedly down to just four percent, she added a chilling final warning: “If I die, it was Greg.” Kylee was approximately 11 weeks pregnant at the time. Her family became increasingly worried when they could no longer reach her and noticed that she had stopped posting on social media, something she regularly did.

Instead of immediately revealing what had happened, Groom contacted Rehoboth police on August 8 and reported Kylee missing. He claimed that the couple had argued and that she had left his home. Investigators continued looking into her disappearance, eventually returning to question him. When detectives told Groom they had a search warrant and were prepared to dig through his property, he reportedly drew a map showing where her body could be found. He then admitted that he had stabbed Kylee twice in the neck and once in the chest during an altercation behind a shed on the property.

According to prosecutors, Groom told investigators that he spent several hours digging a grave in the nearby woods, approximately 20 yards from where the killing occurred. He placed Kylee’s body inside the five-foot hole and covered it with dirt. Search teams later discovered blood and other evidence near the shed, along with freshly disturbed ground beneath piles of cut branches and trees. Kylee’s remains were recovered from the grave, bringing an end to the search for the missing teenager.

Kylee had recently graduated from Attleboro High School and earned a welding certificate, hoping to build a career in the trade. Her family described her as a bright, energetic young woman with a promising future. Her death was especially devastating because she was expecting a child. Her sister, Faith Monteiro, had publicly urged prosecutors to reject a plea agreement, fearing that Groom could eventually be released after serving a relatively limited portion of his sentence.

On November 10, 2026, Groom pleaded guilty to second-degree murder and witness intimidation. A judge sentenced him to life in prison, with the possibility of parole after 25 years, and an additional three to five years for witness intimidation. The sentences will be served consecutively. Although the plea agreement meant Groom avoided a first-degree murder conviction, the sentence ensures that he will spend decades behind bars before becoming eligible for parole. For Kylee’s family, the outcome brings a measure of legal accountability, but it cannot restore the young woman and unborn child they lost.

Source: https://lawandcrime.com/crime/boyfriend-who-murdered-pregnant-girlfriend-buried-her-body-in-5-foot-grave-after-she-texted-sister-if-i-die-it-was-greg-is-headed-to-prison/