This isn’t execution (which even in the case of the death penalty merely means to perform a deed).
Take a closer look at the facts. Dede went into Kaarma’s garage at 12:30 am; the garage was dark (unlit); the alleged “bait purse” was not only therefore invisible, but located in an obscure corner to boot. Prosecutor Karla Painter alleged that Kaarma could have deliberately aimed and shot Dede in the head successfully in said unlit garage. “Execution”?
Deliberately aiming or not has nothing to do with it either. If he set up a situation to entice a thief, then swept the room with a shotgun when one showed up, that’s not self-defense.