REHOBOTH, Mass. (WPRI) — A 22-year-old man accused of killing his pregnant girlfriend faced a judge Wednesday morning.

Gregory Groom was arraigned on charges of murder, assault and battery on a pregnant victim, aggravated intimidation of a witness, and domestic assault and battery.

The charges come after human remains "consistent" with 18-year-old Kylee Monteiro were found Tuesday on his property.

Groom reported Monteiro missing on Aug. 7 and confirmed she was 11 weeks pregnant at the time.

In court, officials said on Aug. 6, Monteiro took a rideshare to Groom's home and they got into an argument about whether he would allow her to stay there.

When police later interviewed Groom and other family members, Monteiro's sister said that she texted her that day, saying, "He threw me on the

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