Here's the official guide for Castle season 7 episode 13, "I, Witness" - airing February 2nd. 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. SERIES REGULARS: 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 WRITTEN BY:Terence Paul Winter & Amanda Johns DIRECTED BY:Tom Wright
