Jason O'Mara has boarded a currently untitled CBS drama pilot from Ralph Lamb. The actor will co-star alongside Dennis Quaid, Michael Chiklis and Carrie-Anne Moss.

The drama takes place in the 60's and follows the true story of Ralph Lamb, a rodeo cowboy turned longtime Sheriff of Las Vegas, as well as Johnny Savino, a Chicago mob fixer whose entrepreneurial vision for transforming Las Vegas collides with the law-and-order mandate of Sheriff Lamb.

Dennis Quaid will play Ralph Lamb with Jason O'Mara portraying Ralph Lamb's younger brother Frank, the diplomat in the family. Michael Chiklis will play the Chicago mobster.

Michael Reilly Burke will play A.D.A. Katherine O'Connel's (Carrie-Anne Moss) boss, D.A. Reynolds, an alpha prosecutor with a burning ambition for power, with Michael O'Neill playing Vegas Mayor Bennett, a man with a vision. James Russo plays Big Tuna, an old-world gangster who runs Vegas for his Chicago bosses.

This project is still being developed.