BTW you contridicted yourself when you said "...Some serial killes have recored themsleves torturing and killing, but these crimes were not filmed(???)..." And what the fuck is a legitimate murder?
A snuff film is a film in which someone is killed for other peoples pleasure, not the killer's.
Faces of death is in the "mondo" catergory. Executions arn't snuff films, they are execution tapes.
BTW, of course there has been footage of real killings (to the guy who said there isn't)Nick Berg? Dan Pearl? The Columbine Massacre?
8mm is a film about snuff
So to answer any questions, there are no movies in existence that show a human being actually being killed.