Robert Redford 's extraordinary, decades-long bond with Paul Newman is now at the center of renewed attention following Redford's death at 89, and RadarOnline.com can reveal new details about the pair's private friendship, including their unmade final film and the huge pranks they pulled on each other but never discussed.

Redford, who died in his sleep on September 16 , spent more than half a century intertwined with chain-smoker Newman, who was killed by lung cancer in 2008 at the age of 83 . Article continues below advertisement

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Though they appeared together in only two films, their partnership shaped

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