Alan Hernandez Lopez was 16 when he was shot and killed while walking home from school in South Salt Lake, Utah, on Tuesday afternoon, February 13, 2018. A sophomore at Cottonwood High School, he helped his single mother care for three younger siblings, worked part-time, and hoped to become a U.S. Marine. He was struck after a brief street confrontation near 3100 S. 300 East shortly after 4 p.m.

Surveillance from the school recorded a confrontation lasting just over a minute during which gang-related insults and threats were exchanged. Park then fired two shots, striking Lopez, who was taken to a hospital and died just after midnight.

Investigators later served a search warrant at Park’s home; he admitted to the shooting and said the exchange of gang signs and calls prompted him to confront Lopez. Park was arrested and charged with murder and felony discharge of a firearm.

Did anyone in the Salt Lake area witness the encounter or have information about Lopez’s route that afternoon?