NBC is starting its fall season with several shows returning while dealing with offscreen cast exits. The One Chicago franchise has made headlines over the years as cast members often come and go across all three shows. Over on Law & Order, Detective Theo Walker (David Ajala) will be getting a new partner during season 26 after Detective Vincent Riley (Reid Scott) is written off. Related: Which 'Law and Order' Stars Are, Aren't Returning for Season 26 After Exits? Law & Order is returning for season 26 on NBC — but not every cast member is coming back to the show.