Has a hitman or assassin like Lorne Malvo ever…

To elaborate, in real life, most hitmen or assassin’s are more professional, they’re usually not psychopaths, they view it as they’re a weapon and whoevers ordering the hit is the killer, they just see it as any other jobs, I wonder if a Hitman like lorne malvo has ever existed, I mean I’m sure in the huge world we live in there has.

This is what you want