A 22-year-old Rehoboth man has been indicted for the stabbing murder of his 18-year-old ex-girlfriend who was pregnant with their child.

“My phone is at 4% and if I die, it was Greg,” Kylee Monteiro allegedly texted her sister on Aug. 6, 2020.

A Bristol County grand jury indicted Gregory Groom with murder and witness intimidation in the Aug. 7, 2020, killing of Monteiro at his 107 County Street home in Rehoboth. Groom is scheduled to be arraigned in Fall River Superior Court on Tuesday.

Groom allegedly admitted to police he stabbed her to death and buried her body in the woods, according to the prosecutor at his district court arraignment.

Groom called local police on Aug. 8 and told them that Monteiro had gone missing after leaving his home the night before, prosecutor Jason Mohan said at Groom’s initial arraignment in Taunton District Court following his arrest. Groom allegedly told police that she had come over and asked to stay there for the night. The pair got into an argument, he allegedly told police, and she walked out.

Police investigated and found that Monteiro, known to be an active social media user, neither posted to any platforms nor contacted any friends or family in the days since Groom reported her missing, according to the reading of probable cause. Police called Groom in for a formal interview.

There, the prosecutor said, Groom told them that Monteiro left some sort of residential program and got a ride to Groom’s house, where she informed Groom she was 11 weeks pregnant with his child and that she needed a place to stay.

According to alleged text messages Monteiro sent her sister, the conversation got heated and then the interaction turned violent.

Prosecutors say that Monteiro texted her sister that “he threw me on the ground and pulled my hair and strangled me” before warning her that her phone was low on battery and that if she died to suspect that Groom was responsible. The sister and other family members texted back to check in and didn’t hear a response for a while until finally a text message sent from her phone indicated she was still attempting to stay at Groom’s home.

Local police searched Groom’s County Street property, which is roughly 25 acres, on Aug. 14 with the assistance of the Massachusetts State Police, Air Wing divers and cadaver dogs but didn’t find anything, according to prosecutors.

They called Groom back in for another interview where he allegedly admitted to assaulting Monteiro when she came over. Police said with that information they were going to charge him with multiple assault and battery charges, but that they suspected Monteiro was actually dead. They told Groom that they had a warrant to do a more thorough search of his property, including digging up the grounds, and to tell them where Monteiro’s body was.

“Mr. Groom then paused,” the district court prosecutor said.

Groom then allegedly “drew a rudimentary map” for police and admitted to stabbing Monteiro to death with a kitchen knife, according to the prosecutor.

Groom allegedly told police he spent hours digging a hole in the woods about 20 yards from where he killed Monteiro, the prosecutor continued. He pushed her body into the hole as the sun rose and covered it with dirt.