"Ms. Montero texted a sister that, '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,'" a prosecutor said in court. Prosecutors say Groom was initially charged with assault and battery of a pregnant woman, intimidation of a witness, and domestic assault and battery.

Gregory Groom, 22, is accused of killing 18-year-old Kylee Monteiro, who was 12 weeks pregnant and was last seen earlier this month.