Sean Hennigan is an American actor. He plays Sheriff Clyde Herrigan in Vegas. He is a guest star in the first season episode "Pilot". He has been active since 1989 and has also appeared in the series Lonesome Dove and the films The Life of David Gale (2003), and The Three Burials of Melquiades Estrada (2005). He has worked extensively as a voice actor including the game Deus Ex and the series One Piece and Romeo x Juliet. He has worked with Vegas Executive Producer James Mangold on his film 3:10 to Yuma (2007).