Most Cold Blooded Performances By An Actor

[CGM]

Id toss on
Christopher Lee in all of his Dracula flicks
Woody Harrelson in Natural Born Killers
Clint Eastwood in almost everything he's ever starred in

The way he polished off Gene Hackman in Unforgiven was pretty cold blooded, for sure.

[Wayne]

Sean Penn's wife in Mystic River
Samuel L. Jackson in Pulp Fiction
Ving Rhames in Pulp Fiction
That Asian chick in Audition
Phillip Seymour Hoffman in Mission Impossible III