Ersland has said he opened fire in self-defense.
Parker was shot once in the head and five times in the stomach area. An autopsy determined Parker was still alive after being shot in the head.
Ersland says two people in ski masks threatened him and two other employees at Reliable Discount Pharmacy and because he's disabled he couldn't run. Ersland says he took a pistol from his pocket and shot Parker in the head -- then shot him five more times as the teenager tried to get up.