It doesn't matter if it was an intended kill or not. It still counts as murder. Nor can it be mitigated to self-defense. For one to be able to legally claim self-defense, one must not have been doing anything illegal oneself, at the time, at all. He had illegally entered that man's address in the first place, and armed, I should add. Just like if a bank robbery occurs. If a robber accidentally shoots and kills an innocent bystander, and/or if, say, a cop or security guard fired at a robber and missed and accidentally killed a bystander, the robber would be guilty of that person's murder. And I'm sure he does have good people in his family. But having good, likable people in one's family does not mean that one himself/herself is a good person. Many evil people come from good families. This in no way excuses or justifies one's own behavior. The fact that he was illegally broken into that man's address, and armed completely destroys any attempt to claim self-defense, regardless of whether he actually meant to kill him or not.