The project is based on the bestselling book by David Grann, "Killers of the Flower Moon: The Osage Murders and the Birth of the FBI", reported Variety.
According to Scorsese's longtime production designer, Dante Ferretti, the filmmaker hopes to start shooting "Flower Moon" in the spring of next year.
Ferretti, who has worked with Scorsese on nine movies from "The Age of Innocence" through "Silence," said he was going to "go to Oklahoma" to do preliminary location scouting for "Flower Moon."
Scorsese and DiCaprio have been eyeing the project for months, and are developing it together with Dan Friedkin and Bradley Thomas, co-founders of Imperative Entertainment.
Rights to "Flower Moon" were snapped up by Imperative last year for a reported USD 5 million, and a script has reportedly been drafted by veteran Oscar-winning scribe Eric Roth.
Ferretti said that "the whole 1920s world of the Indians who lived there needs to be reconstructed" for "Flower Moon," adding that he expects to "start preparing this film in September, because Scorsese will shoot it immediately after finishing 'The Irishman.
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