Don't know if anyone has ever heard of this guy before. He was a mafia hitman who claims to have killed more than 300 people. I discovered him about 3 or 4 years go when I saw these interviews of him (be sure to set aside a lot of time to watch this because you WILL become glued to the screen when watching him):
Part 1: http://www.youtube.com/watch?v=Tv4c3flhSaU
Part 2: http://www.youtube.com/watch?v=007UO2aOm-U
A psychiatrist interviews him: http://www.youtube.com/watch?v=psoq8qYvx18
A movie is being made about him, set for release in 2013:
Small scene/trailer from the movie: http://www.youtube.com/watch?v=ArrcnjJgy88
http://www.imdb.com/title/tt1491044/