Left: Gregory Groom (WBZ). Right: Kylee Monteiro (GoFundMe).
A Massachusetts man who fatally stabbed his girlfriend at his home, buried her in a 5-foot-deep grave and then reported her missing is headed to prison after admitting he lied to police about what happened.
Gregory Groom, 23, pleaded guilty to second-degree murder and witness intimidation in the death of 18-year-old Kylee Monteiro in Rehoboth, about 50 miles southwest of Boston. A judge sentenced him to life in prison with the possibility of parole for the murder, plus three to five years for witness intimidation. The terms will be served consecutively.
In recent weeks, Faith Monteiro, Kylee’s sister, urged supporters on Facebook to contact the Bristol County District Attorney’s Office and oppose the plea agreement, which could eventually make Groom eligible for release. He initially faced a first-degree murder charge carrying a life sentence.
The family feared he might spend fewer than 20 years behind bars.
“How can you call that justice?” Faith said in a September interview with local Fox affiliate WFXT. “Two lives were lost, and he’s not even going to serve the lifetime of the kid he should be raising.”
Prosecutors said Groom called Rehoboth police on Aug. 8, 2025, claiming Monteiro had been at his home two days earlier while looking for somewhere to stay. He told officers they had argued and that she left, adding that no one had heard from her since. At an earlier hearing, District Attorney Jason Mohan said Groom also pointed out that Monteiro was usually active on social media but had not posted since he last saw her.
Detectives then interviewed Monteiro’s sister, who said she received a text from Kylee on Aug. 6, 2025. The message allegedly read, “he threw me on the ground and pulled my hair and strangled me. My phone is at 4% and if I die it was Greg.” Relatives tried to contact Monteiro but were unable to reach her.
Prosecutors also told the court that Monteiro was 11 weeks pregnant when she was killed.
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On Aug. 14, 2025, police searched Groom’s 25-acre property with cadaver dogs and an emergency response team. The search initially turned up no evidence.
Groom later spoke with investigators again and allegedly acknowledged that he had fought with Monteiro. He said he knocked her cellphone from her hand during the confrontation. When detectives told him they planned to search the property again and would “dig if necessary,” his account changed.
“Mr. Groom then paused,” Mohan said. “He was given an opportunity to tell the police where Ms. Monteiro’s body was located either by being taken to his property and pointing it out or drawing a map or telling officers where her body was located, as they believed Ms. Monteiro was dead.”
Groom drew what prosecutors described as a “rudimentary” map identifying a shed on the property. He allegedly told police that he stabbed Monteiro twice in the neck and once in the chest on Aug. 6, 2025. The kitchen knife broke when he stabbed her in the chest, he said. After she died, Groom spent the night and the early morning hours digging a grave. When the hole reached a depth of about five feet, he placed Monteiro’s body inside and covered it with soil.
Investigators went to the shed and found a large pile of brush. Beneath it was a pool of blood, which authorities believe marked the location of the killing. Roughly 20 yards away, officers discovered “feet upon feet” of cut trees. After moving the trees aside, they found an area of freshly disturbed earth.
Monteiro’s body was buried in the hole.
Monteiro had planned to pursue a career in welding and had graduated from high school only months before her death.
“Kylee was a bright and spirited young woman who graduated from Attleboro High School in 2025,” her obituary said. “With a passion for welding, she proudly earned her welding certificate and was eagerly looking forward to a promising career in the field. Her vibrant personality shone through her love for posting on the internet and interacting with her friends.”
The post Boyfriend who killed pregnant girlfriend and buried her in a 5-foot grave after she texted her sister, “if I die it was Greg,” is headed to prison first appeared on Law & Crime.