He disabled the robber, got another gun and executed him while he was unconscious.
And?
Until the robbing thug perp is pronounced dead on the scene he’s a mortal threat. Moving or not.
You were there?
This is why you should do what that pharmacist did.
Justice for Don Berkebile, Retired Smithsonian Curator Homicide Unresolved
http://www.freerepublic.com/focus/f-news/2726833/posts
Don Berkbile was murdered by his neighbor, a larger and much younger man. Don was attacked and shot the man with a pistol loaded with birdshot, who then pretended to be unconcious. When Don approached him, he attacked Don and beat him to death.
And the police cannot charge him with murder or manslaughter?
The moral of the story is use a Magnum44 and don’t approach the POS you just shot!