Actors Keir O'Donnell, David Denman, Shannon Lucio, and Eric Lange have signed on for the TNT Western pilot Gateway.

The story is set in the 1880s and centers on three brothers who step up to enforce the law in their small Colorado town after their sheriff father is murdered. We reported last month that Cam Gigandet will star as one of the brothers, Luke. Keir O'Donnell and David Denman will portray the other two brothers, Daniel and Terence. Shannon Lucio will play Terence's wife, while Eric Lange plays the town's banker. Keith Carradine also recently signed on to play the brothers' surrogate father.

Bruce C. McKenna and Danny Cannon wrote the pilot script, which Danny Cannon will direct from. It isn't known when production on the pilot will begin.