Jackson will star as a homeless man who is mistaken for a famous boxer by Hartnett's character. According to Variety, the story's based on articles by Los Angeles Times reporter J R Moehringer.
Hartnett will next be seen in Lucky Number Slevin with Bruce Willis and The Black Dahlia for director Brian De Palma.
Jackson has Snakes on a Plane opening in a few months and just wrapped work on Black Snake Moan.
Source: Variety
