I willTake a look at the videos posted on this thread that discuss which shots are maybe self-defense and others legally in doubt by lawyers and other informed parties.
This guys lawyer has a few options here
Deadly force in defense of "tangible" property and there is another who section that deals with crime against property after dark and it looks like it was dark.
I bet there is a plea to a misdemeanor of leaving the scene or some bullshit charge
The robber needed a clean killing and he got one
What really makes me like him is how he walks over to the table and finished his coffee before he left.
Thats legend shit..lol