Peacock’s limited suspense thriller Long Bright River, based on the New York Times bestseller by Liz Moore, has added six in recurring roles: Dash Mihok (Ray Donovan), Britne Oldford (Dead Ringers), Matthew Del Negro (City on a Hill), Harriet Sansom Harris (Hacks), Patch Darragh (Succession), and Perry Mattfeld (In the Dark).

Mihok plays Eddie, with Oldford as Aura, Del Negro as Simon, Harris as Mrs. Mahon, Darragh as Sergeant Kevin Ahearn, and Mattfeld as Paula. As previously announced, Amanda Seyfried and Nicholas Pinnock lead a cast, also featuring Ashleigh Cummings, Callum Vinson, and John Doman.

The show follows Seyfried’s police officer, Mickey, as she patrols a Philadelphia neighborhood hard-hit by the opioid crisis. When a series of murders begins in the neighborhood, Mickey realizes that her personal history might be related to the case.

Nikki Toscano and Liz Moore are writing and exec producing, with Toscano serving as showrunner.