WHEN HAYLEY'S A SUSPECT, CASTLE AND BECKETT MUST DECIDE IF SHE'S FRIEND OR FOE, ON ABC'S "CASTLE"

"Backstabber" - After Hayley does a favor for an old friend, she finds herself implicated in a killing and cyber-terror attack. Now, Beckett and Castle must rush to solve the case and clear Hayley's name, on "Castle," MONDAY, APRIL 18 (10:00-11:00 p.m. EDT), on the ABC Television Network.

"Castle" stars Nathan Fillion as Richard Castle, Stana Katic as NYPD Captain Kate Beckett, Tamala Jones as Medical Examiner Lanie Parish, Jon Huertas as NYPD Detective Javier Esposito, Seamus Dever as NYPD Detective Kevin Ryan, Molly Quinn as Alexis Castle with Susan Sullivan as Martha Rodgers. For Season Eight, Toks Olagundoye ("The Neighbors") joined the series as Hayley.

Guest cast: Oliver Muirhead as Bryce Robert, Billy Ray Gallion as Marcus Janek, David Hoffman as Ned Werner, Bree Williamson as Karla.

"Backstabber" was written by Robert Bella and directed by Jessica Yu.

"Castle" is produced by ABC Studios. Executive producers are Terence Paul Winter, Alexi Hawley, Rob Bowman, Rob Hanning and Armyan Bernstein.

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