TO SOLVE A MURDER, CASTLE AND BECKETT MUST GO UNDERCOVER AT AN OLD WEST RESORT, ON ABC'S "CASTLE"

"Once Upon A Time in the West" - When Castle and Beckett learn that a murder victim may have been poisoned at an Old West-style resort, they visit the resort posing as newlyweds to uncover the truth, on "Castle," MONDAY, APRIL 6 (10:01-11:00 p.m., ET) on the ABC Television Network. (Rebroadcast. OAD: 11/17/14)

"Castle" stars Nathan Fillion as Richard Castle, Stana Katic as NYPD Detective Kate Beckett, Susan Sullivan as Martha Rodgers, Molly Quinn as Alexis Castle, Penny Johnson Jerald as NYPD Captain Victoria Gates, Tamala Jones as Medical Examiner Lanie Parish, Jon Huertas as NYPD Detective Javier Esposito, and Seamus Dever as NYPD Detective Kevin Ryan.

Guest Cast: Sarah Butler as Whitney Williams, Hector Hank as Dr. Neville, Tyler Hilton as Tobias, Keith Szarabajka as James Grady.

"Once Upon A Time in the West" was written by Terence Winter and directed by Alrick Riley.

"Castle" is produced by ABC Studios. The executive producers are Andrew Marlowe (creator), David Amann (showrunner), Rob Bowman, Armyan Bernstein, Rob Hanning and Terri Edda Miller.

"Castle" is broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1 channel surround sound. This program carries a TV-PG,L parental guideline.

For more information on "Castle," visit ABC.com