Glenn Fleshler (True Detective) has booked a series regular role on HBO’s Barry, a half-hour comedy pilot starring, directed and co-written by Bill Hader. It centers on an ex-Marine (Hader) who works as a low-rent hitman in the Midwest. Lonely and dissatisfied in his life, he begrudgingly travels to Los Angeles to kill someone and ends up finding an accepting community in a group of eager hopefuls within the L.A. theater scene. Fleshler, repped by Gersh and Suskin Management, will play Goran, a Russian gangster. He has a season-long arc on Billions, recurred on Boardwalk Empire and played lawn-mowing monster Errol Childress on the first season of True Detective.

Matt Barr has joined the cast of Amazon pilot The Interestings, from Sony TV’s TriStar Television. Written by Nip/Tuck alums Lyn Greene and Richard Levine and directed by Mike Newell, The Interestings is described as a grounded. character-driven drama based on Meg Wolitzer’s novel about a group of friends who meet at an arts camp when they’re 15 in 1974. The series chronicles their relationships throughout the next three decades dealing with the great expectations of youth juxtaposed with the realities life hands you as you get older. Barr will play Goodman Wolf, the brother of Ash Wolf. Barr recently shot a lead role in Bill Macy-directed The Layover opposite Kate Upton and Alexandria Daddario. He’s repped by Luber Roklin, UTA and attorney Allison Binder.