Christopher Nolan

Batman 3 the Batman a fictional character, a comic book superhero co-created by artist Bob Kane and writer Bill Finger, appearing in publications by DC Comics.

The character first appeared in Detective Comics  in May 1939., director Christopher Nolan announced For me, Heath was the definitive Joker, Nolan said, It wouldnt feel appropriate to readdress that character

Source: http://www.coldbee.com/2010/07/batman-3-movie-watch-trailer-soon/