Hi, I saw a movie last year on TNT, animated, comic style, and it was about some guy who got on a case with a little girl being followed by some mob guys the bad guy is actually green colored in the movie, while everything else is kind of black and white, the guy is thrown in jail for years and the little girl sends letters to him, he says it's the only thing keeping him sane and by the time he gets out he finds the girl and they fell in love. Anyway in the end he kills the bad guy and him almost dead, kills himself. He actually narrates the whole movie until the end. Any ideas?

Sin City (2005) (http://www.imdb.com/title/tt0401792/)

That's the movie! Thank you a lot!