"Abraham Lincoln: Vampire Hunter" star Benjamin Walker has joined the Stephen Frears-helmed Muhammad Ali biopic "Muhammad Ali's Greatest Fight" for HBO Films says Variety.
The story chronicles Ali's trial following his arrest for anti-Vietnam sentiments and behavior after bring drafted. Walker will play Supreme Court clerk Kevin Kennedy who supported Ali and even wrote briefs which ultimately lead to approval of Ali's status as a conscientious objector.
Christopher Plummer and Frank Langella also star as Supreme Court judge John Marshall Harlan and Chief Justice Warren Burger respectively. Walker's involvement was made possible after the collapse of Alex Proyas' "Paradise Lost" freed up his schedule.
Frears will apparently use archival footage of Ali rather than hiring an actor to play him. Shawn Slovo wrote the script while Scott Ferguson is producing.