Wayne had been ill for much of 1974, having had a severe bout of viral pneumonia after filming True Grit sequel Rooster Cogburn, with Katharine Hepburn.
It caused Duke to cough so violently that he damaged a heart valve causing more problems when he did eventually film The Shootist.
At first, his poor health and stamina on Rooster Cogburn meant he wasn’t initially considered for what would be his final film.
The likes of Charles Bronson, Clint Eastwood, George C Scott, Paul Newman and Gene Hackman were offered the role but passed on it.
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