A high-profile trial starts Monday in North Texas.
Jury selection starts in the Valero gas station murders that took place in Fort Worth in March, 2010.
Killed in the robbery were the 23-year-old clerk, Daniel Rojas and 70-year-old deliveryman Jerry Barnett.
Fort Worth police arrested Kwame Rockwell, Randy Seibel and Chance Smith and charged each with capital murder.
On trial first is Rockwell and prosecutors are seeking the death penalty.
Investigators have said that the three all knew the victim, visited the store regularly and worked a car lot right next door.
Surveillance video released by Fort Worth police shows Rojas complied with the bandits' demands, gave them money and held his hands up. One of the gunmen grabbed the clerk's neck and appeared to shove him around the counter before he was shot and killed.
Investigators said one of the suspects arrested admitted that Rojas was killed because he could identify them.
