Actress Charlize Theron is in talks to replace Brad Pitt in the big screen adaptation of ?The Gray Man.? Pitt originally signed on to front the film in 2011, but he has since dropped out, and moviemakers are now considering switching the gender of the lead character. ?The Gray Man? will be based on Mark Greaney?s 2009 novel about a Central Intelligence Agency employee who becomes a hitman in a bid to save his daughters. James Gray and screenwriters Joe and Anthony Russo were attached to helm the film, but filmmakers are still searching for a new director.