According to what was seen in the video the shooting was justified self-defense. What happened prior to that is immaterial really in the eyes of the court. Keep in mind that he'd been charged with murder and claimed self defense in regards to the act of killing Childress. From what can be seen its self defense regardless of how immoral or wrong the events that lead up to this might have been.
To all of you who are saying you wouldn't have shot because he was unarmed... how do you know he was unarmed? He could have had a knife tucked behind his shirt... and I know of plenty of guys who could kill you without a weapon. I'll be frank and say that if it was one of them and you'd messed with their wife you'd better gun them down if they were rushing you like that. If not it'd be you dead on the ground and him being arrested for murder - and he wouldn't need a weapon for that.
Forget all the movie and macho stuff about not shooting someone who seemed unarmed. If you perceive your life or physical safety in actual danger the do what you carry for - draw and defend yourself. There's a quote I've read around here often - "I'd rather be judged by 12 than carried by 6." This is all too true. If you're not prepared to draw and shoot to defend yourself or you loved ones just because you think your attacker is unarmed then sell your EDC weapon and learn to fight like Jet Li.
This is who we are, what we do.