Edit: I mean on purpose, obviously. Drunk driving hardly counts. (Nobody gets in a car drunk with the intention of hurting anyone, they are usually just trying to get from A to B.) Accidents don't count. We're talking about a comparable action here, something that meets the legal definition of murder and which was also not prosecuted. Deeds from war probably don't count because it doesn't meet the definition of murder under law (although, many war crimes and misdeeds abroad are punished) and soldiers are peons. Cops killing people on duty don't count because they aren't doing it unprovoked (when they do, it is usually prosecuted as murder), and they too are peons.
Also, to the people complaining about the edits, sorry I can't reply to 50 comments all saying about the same kind of stuff. I keep hitting the rate limit.