CASTLE TAKES ON A ROUTINE P.I. CASE, BUT THE INVESTIGATION TURNS DEADLY WHEN HE WITNESSES A MURDER, ON ABC'S "CASTLE"

"I, Witness" - Castle is hired to uncover if a client's husband is having an affair, but the case takes a shocking turn when Castle witnesses the client's murder - by her husband. But with no proof that the killing took place, Castle and Beckett must investigate to expose the truth, on "Castle," MONDAY, FEBRUARY 2 (10:01-11:00 p.m., ET) on the ABC Television Network.

"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: Brianna Brown as Eva Whitfield, Ivan Sergei as Cole Whitfield, Gregory Zarian as Scott Galloway, Audrey Marie Anderson as Aubrey Haskins.

"I, Witness" was written by Terence Paul Winter & Amanda Johns and directed by Tom Wright.

"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,D,L,S,V parental guideline.

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