After countless delays in scheduling and production, Martin Scorsese’s “Killers of the Flower Moon” began filming a few weeks ago in Oklahoma. 2The film, an adaptation of David Grann’s grisly murder-mystery novel, is set to star Leonardo DiCaprio, Jesse Plemons, Robert De Niro, and Lily Gladstone. The screenplay, written by Eric Roth, takes place in 1920s Oklahoma and tells the story of a corrupt FBI investigation on Osage Indians who suddenly start to get murdered.