Left: Gregory Groom (WBZ). Right: Kylee Monteiro (GoFundMe).
A Massachusetts man who fatally stabbed his girlfriend, buried her in a 5-foot-deep grave and then called police to falsely report her missing is going to prison.
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 sentences will be served consecutively.
In recent weeks, Monteiro’s sister, Faith Monteiro, urged supporters on Facebook to contact the Bristol County District Attorney’s Office and oppose the plea agreement. Groom originally faced a first-degree murder charge, which carries a mandatory life sentence.
The family feared Groom could serve fewer than 20 years.
“How can you call that justice?” she 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, and claimed Monteiro had been at his home two days earlier looking for somewhere to stay. He told officers they had argued, that she left the house and that no one had heard from her since, District Attorney Jason Mohan said during an earlier court hearing. Groom also told investigators that Monteiro was usually active on social media but had not posted since he last saw her.
Detectives then spoke with Monteiro’s sister, who said she received a text from Monteiro on Aug. 6, 2025. The message allegedly stated, “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.” Family members said they tried to contact her but were unable to reach her.
Prosecutors said Monteiro was 11 weeks pregnant when she was killed.
On Aug. 14, 2025, police searched Groom’s 25-acre property with cadaver dogs and an emergency response team but found no body.
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 argument. Detectives told him they planned to search the property again and would “dig if necessary.”
“Mr. Groom then paused,” Mohan told the judge. “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 then drew 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. According to his account, the kitchen knife broke when he stabbed her in the chest. After she died, Groom spent that night and the early morning digging a grave. He pushed her body into the 5-foot-deep hole and covered it with dirt.
Crime scene investigators searched the shed and noticed a large pile of brush. Beneath it, they found a pool of blood where Groom allegedly killed Monteiro. Roughly 20 yards away, officers discovered “feet upon feet” of cut trees. After moving the trees aside, they found an area of freshly disturbed soil.
Monteiro’s body was found in the grave.
Monteiro had been pursuing 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 murdered pregnant girlfriend, buried her body in 5-foot grave after she texted sister ‘if I die it was Greg’ is headed to prison first appeared on Law & Crime.
