Darius Cox was convicted by a Criminal Court jury after witnesses, including two co-defendants, described how the crime was carried out on Nov. 8, 2012, at the Fuel-n-Wash service station at 4509 State Road.
After robbing the clerk at gunpoint, the five men fled in a white Buick that was found an hour later in a nearby apartment complex. The men were inside the car smoking marijuana and officers also discovered a stack of money and a black ski mask similar to one used in the robbery.
A pistol similar to one used in the holdup was found in the apartment of one defendant, while another pistol was found in the bedroom of the apartment where Cox lived.
The five suspects were arrested and gave statements admitting their involvement in the robbery.
Cox will be sentenced later this month by Judge W. Mark Ward.
Three codefendants have pleaded guilty and are serving prison sentences, while a fourth defendant will be in court this month.
The case was handled by assistant district attorneys Bryce Phillips and Omar Malik.