On June 30, 2017, 40-year-old Martin Padilla, a U.S. Army veteran, was teaching his teenage son to drive in Marana, just outside Tucson, when a traffic dispute with Marcus Dickson escalated. After Dickson reportedly honked when Padilla did not move immediately on a green arrow, the two men pulled into a Walmart parking lot and a physical fight broke out. Padilla was on top of Dickson when Dickson drew a firearm and shot him; Dickson fired a second time as Padilla tried to get up. Padilla’s four children were in his vehicle during the confrontation; his eldest led the younger siblings into a nearby ice cream shop to wait for their mother.

Dickson was indicted on second-degree murder but was later convicted of manslaughter. In July 2018 a judge sentenced him to nine years in state prison. Martin Padilla is remembered as a devoted husband and father of four.