An 18-year-old man died more than 15 hours after he was shot early Sunday in the Marquette Park neighborhood on the Southwest Side.

At 2:53 a.m., Luis Fernando Mena-Castro was standing with a group of people in an alley in the 2500 block of West 63rd when someone fired shots from a white car, according to Chicago Police and the Cook County Medical Examiner’s Office.

Mena-Castro, who lived in north suburban Northlake, was shot multiple times in the head and taken to Christ Medical Center in Oak Lawn, where he was pronounced dead at 6:16 p.m., authorities said.