Apple adds more cast members to 'Killers of the Flower Moon,' 'Masters of the Air'

William Belleau, Louis Cancelmi, Jason Isbell, and Sturgill Simpson will join Martin Scorsese's "Killers of the Flower Moon," according to Deadline.

Set in 1920s Oklahoma, "Killers of the Flower Moon" depicts the serial murder of members of the Osage Nation, a string of crimes that came to be known as the "Reign of Terror." The film stars Leonardo DiCaprio as Ernest Burkhart and Robert De Niro as his uncle, a powerful local rancher.

Belleau will play Henry Roan, an Osage rancher. Cancelmi will play Kelsie Morrison, a local hustler and friend of Burkhart. Simpson will join as rodeo champion and bootlegger Henry Brammar, while Isbell will make his acting debut as Bill Smith, an adversary of Burkhart.

Additionally Deadline reported Monday that Raff Law has joined the case of "Masters of the Air," a limited series from Tom Hanks and Steve Spielberg that follows the true story of a group of bomber pilots during WWII.

Written by "Band of Brothers" alumni John Orloff and Graham Yost, "Masters of the Air" is currently in production in the UK, Deadline added.