I don't really know - I wasn't there, and the other party is dead
This is one of the real problems I have with "Stand Your Ground" laws, like the one in Florida that allowed George Zimmerman to escape charges in the death of Trayvon Martin. It doesn't even boil down to a "he said, he said" kind of argument - conflicting accounts of what happened, like some bad replay of Rashomon . Instead, it's "he said, and the other guy's dead," which doesn't sound like a good way to get at the truth, let alone justice.
("Stand Your Ground" is a somewhat different situation than cops shooting subjects, or Castle Doctrine laws involving one's own home. The situation is the same - one guy's dead - but the context of who did the shooting and where provide more latitude.)