Well if I haven't killed someone with a plan to get away with it, but I have still killed someone, I'm going to guess it was out of anger or self-defense. In the case of the latter, I'd just go to the cops and admit it. If I get locked away, that gives me something to yammer on about for decades and I can make plenty of money when released. If it was out of anger, I'd probably just go crazy from remorse and eat them or something.