EXCLUSIVE: Gregory Alan Williams (The Righteous Gemstones), MacKenzie Porter (Hell on Wheels), and Tim Matheson (Virgin River) have joined the recurring cast of ABC’s 9-1-1: Nashville.

They join Chris O’Donnell, Jessica Capshaw, Kimberly Williams-Paisley, LeAnn Rimes, Hailey Kilgore, Michael Provost, Juani Feliz, and Hunter McVey, who were previously announced.

9-1-1: Nashville is described as a high-octane procedural about our heroic first responders, as well as their family saga of power and glamour set in one of America’s most diverse and dynamic cities.

Williams will play Harold Foster, a fire station chief; Porter as Samantha Hart, an ER doctor at a Nashville hospital; and Matheson as Edward, Southern old money, and utterly ruthless.

The project received a straight-to-series order from the network in February. The new offshoot joins the mothership series 9-1-1 on ABC, where it moved in 2023 following its cancellation at Fox. The second series from the franchise, 9-1-1: Lone Star, was canceled after five seasons in 2023 and completed its run early this year.

20th Television, in association with Ryan Murphy Television, will produce the series. Murphy, Tim Minear, and Rashad Raisani will serve as executive producers and writers, with Chris O’Donnell, Brad Buecker, Brad Falchuk, and Angela Bassett also executive producing. Raisani serves as showrunner.

Williams is repped by STW Talent Agency, and Vault Entertainment; Porter is represented by Link Entertainment and Red Management; Matheson is repped by Gersh.