Publicist Joy Fehily released a statement from Clarke's fiancée, Omarosa Manigault, saying the 54-year-old actor died Monday morning in a Los Angeles hospital after nearly two months of treatment following the July 13 heart attack.
The 6-foot-5, 300 pound Duncan appeared in dozens of films, including such box office hits as Armageddon, Planet of the Apes and Kung Fu Panda.