Several big-name stars are still circling the secretive project, with Margot Robbie and Tom Cruise being eyed for big roles.

After a heated bidding war, Sony picked up the rights to the feature back in November. The studio has set an Aug. 9, 2019, release date. That day also marks the 50th anniversary of the murders of Tate and her friends by the followers of Manson.

Sony declined to comment on the most recent casting news.

DiCaprio hasn't been seen on the big screen since his Oscar-winning turn in The Revenant, but he has lined up numerous high-profile projects, including a reunion with longtime collaborator Martin Scorsese for a Teddy Roosevelt biopic at Paramount.

DiCaprio is repped by LBI and Hansen Jacobson.