Gregory Groom, of Rehoboth, confessed to police that he stabbed Kylee Monteiro multiple times with a kitchen knife, according to prosecutors.

The suspect in the murder of 18-year-old Kylee Monteiro faced a judge Wednesday morning where prosecutors recounted Gregory Groom's confession in the incident to Rehoboth police.

He threw me on the ground, and pulled my hair and strangled me,” she texted her sister. “My phones at 4 percent if I die, it was Greg.”

The day before prosecutors say her boyfriend stabbed her three times, 18-year-old Kylee Monteiro sent an ominous warning to her sister: "If I die it was Greg."

The allegations were detailed in police reports and by a prosecutor Wednesday in Taunton District Court, where Gregory R. Groom pleaded not guilty to charges of murder and assault and battery on a pregnant victim in connection with the death of Kylee Monteiro.

A Rehoboth man charged with murder reportedly drew a map pointing to a five-foot hole that he dug to bury his pregnant 18-year-old ex-girlfriend in after he stabbed her to death with a kitchen

A haunting text was revealed in court Wednesday as Gregory Groom was charged with murder in the death of his pregnant 18-year-old girlfriend Kylee Monteiro in Rehoboth, Massachusetts. WBZ-TV's Juli McDonald reports.