On October 28, 2023, a shooting at a house party in the 300 block of Roslyn Avenue on San Antonio’s west side left 30-year-old Jennifer Colin and 40-year-old Marvin Medrano dead from gunshot wounds to the head. The confrontation began after an argument between a party attendee and a neighbor; the neighbor returned with relatives and, according to reports, 20-year-old Raul Trevino III allegedly opened fire, striking Medrano, Colin and Medrano’s 13-year-old daughter. Medrano, who had a gun, returned fire and wounded Trevino and a relative. The 13-year-old and other injured people were taken to hospitals with non-life-threatening injuries.

Trevino was arrested and booked in Bexar County on capital murder and aggravated assault charges; bond was set at $825,000. Family members said the dispute grew out of a feud between two teenage girls, one of them Medrano’s daughter. Jennifer Colin had just turned 30 the day before and was remembered by family as a loving aunt who cared deeply for her relatives.

If anyone at the party or nearby saw what happened or has information about the escalation that night, please share it with investigators.