On November 8, 2018, a prearranged meeting at Tucson’s Lakeside Park ended in a deadly exchange of gunfire. According to investigators, 16-year-old Carlos Ross and 21-year-old Matthew Favela drove to meet 16-year-old Amonn Sandoval in the park’s west parking lot shortly before 5:00 p.m. A confrontation between two groups escalated into gunfire; three young men were struck. One victim was pronounced dead at the scene, and Carlos Ross and another victim were taken to Banner University Medical Center with life-threatening injuries and died shortly after arrival. The third fatality was identified as Amonn Sandoval.

Detectives said two friends who arrived with Ross and Favela remained at the scene and cooperated, while an unknown male with Sandoval fled before police arrived. The Tucson Police Department treated the incident as a triple homicide; gang detectives assisted but authorities stated the shooting did not appear to be gang-related. Arrests were later made in connection with the shootout.