Sterlin Harjo perfected the “art of the hang” with the co-creation of his first television series, “ Reservation Dogs .” The FX drama followed a group of Indigenous teens living on a fictional Oklahoma reservation, turning their everyday routine into high art — and is one of the best television shows of the 2020s.

Now, Harjo, 45, is tackling another type of genre: crime. His forthcoming series “The Lowdown,” premiering Sept. 23 with two episodes on FX, follows self-proclaimed “truthstorian” Lee Raybon (Ethan Hawke) on a mission to unearth buried truths about Tulsa’s problematic history while exposing present-day corruption. He’s a disheveled figure who drives around town in a tattered van and lives above the rare bookstore that he also happens to own. But when his latest exposé for a lo

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