Massachusetts State Police and Brockton Police are investigating an apparent murder-suicide, according to the Plymouth DA’s office.

Police received a 911 call Wednesday afternoon from the landlord at 643 North Main St. — reporting that his upstairs tenant found both his son and his girlfriend dead on the floor of their residence.

Brockton Police, Fire, and Brewster EMS responded to the residence. Upon arrival, first responders found the female victim on the kitchen floor with multiple gunshot wounds. She has been identified as 18-year-old Yoraily Santos.

Police officers found the suspect on the floor of a bedroom with an apparent self-inflicted gunshot wound to the head. He was identified as 22-year-old Starli Roa Taveras. A gun was found near him.

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Brockton Police contacted Massachusetts State Police assigned to the Plymouth DA’s office, and they launched an investigation.

Based on a review of video surveillance from the apartment and statements made, investigators believe that the only two people inside the apartment at the time of the shooting were Taveras and Santos.

Investigators learned from witness interviews that they had a relationship and a history of domestic violence.

In a search of the apartment, police recovered a Glock 19 Gen 5 firearm with an optic sight attached. The gun had an empty magazine with one 9mm round in the chamber. Investigators also recovered nine shell casings and seven projectiles from the apartment.

The investigation was ongoing.