Witness for the Prosecution Castle finally gets his day in court when he takes the stand as the key witness to a murder from five months ago. But when new information suddenly arises, he and Beckett must race against the clock to prevent a miscarriage of justice. Details Casts Title Witness for the Prosecution Genres Drama Crime Release Date 2016-02-14 Episode Runtime 00 Hours 45 Minutes Season Number 8 Episode Number 10 Production Companies Beacon Pictures, Experimental Pictures, ABC Studios, The Barry Schindel Company, MilMar Pictures Nathan Fillion Richard Castle Stana Katic Kate Beckett Molly C. Quinn Alexis Castle Jon Huertas Javier Esposito Seamus Dever Kevin Ryan Susan Sullivan Martha Rodgers Tamala Jones Lanie Parish Toks Olagundoye Hayley Shipton