Stana Katic — who played Detective Kate Beckett, aka one of the show's main characters — was fired during Season 8. Scott Everett White / Walt Disney Television via Getty. "Kate Beckett has On Castle Season 7 Episode 15, in the conclussion of this two-parter, the team at the 12th precinct must outwit 3XK and Dr. Kelly Nieman in order to save Beckett. ABC The writers of "Castle" planned on getting Season 9 greenlit for the series. Because of this, they created a story where Beckett and Castle are attacked and gunned down in their home. The AEFSVqM.