Grant Jonathon Ronnebeck, 21, was working the overnight shift at a QuikTrip in Mesa, Arizona when he was fatally shot shortly after midnight on January 22, 2015. The shooting began during a transaction for a pack of cigarettes: a man later identified as 29-year-old Apolinar Altamirano placed coins on the counter, produced a handgun while Ronnebeck was counting change, and shot him. After the killing Altamirano stepped over Ronnebeck’s body to take cigarettes and fled.

A witness who heard the gunshot alerted a nearby Mesa police officer, touching off a pursuit that ended when officers spun Altamirano’s vehicle and arrested him. Officers recovered a handgun and an unopened pack of cigarettes from his car. Altamirano had a 2012 burglary conviction, was in the country without authorization, and was a prohibited weapons possessor; prosecutors initially sought the death penalty but a court later found him intellectually disabled, barring execution. Ronnebeck’s family and friends remembered him as a dedicated, well-liked young man with a constant smile.

Did anyone who knew Grant or who worked at that QuikTrip notice anything about Altamirano’s behavior before the shooting?