Deadline.com reported the Oscar-winning actor will play an aging actor in Tarantino's as-yet-untitled film, which is set in Los Angeles during the summer of 1969 when the Manson Family murders took place.
Variety said DiCaprio had been in negotiations for months about joining the project.
Sony is scheduled to release the movie on Aug. 9, 2019, which would coincide with the 50th anniversary of the slayings of nine people, including pregnant actress Sharon Tate, at the hands of Charles Manson's followers.
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