HMMMMM hate to say it but in a lot of states killing a fleeing criminal not shooting at you or endangering you would be murder . If there is no threat here in this state you cant shoot . they left the store so the owner is no longer in danger,
the shooter waited out side for them to leave then shot them. unclear if he was in danger .
It would be smart if the shooter to say he had guns pointed at him as they left or at least felt in danger .
glad there dead I hope no charges are filed .