Stephen Addison is a character portrayed by Ian Kahn in the ABC crime series Castle. Stephen is the son and heir of Randolph Addison, and the brother of Lyla Addison, the latest in a long line of prominent, powerful New Yorkers to bear this name. He is seen in Law & Murder, where Otis Williams is on trial for the murder of Lyla, and the D.A. himself, Lou Karnacki, is prosecuting the case. Juror Number Seven, Joe McUsic, drops dead in the courtroom, and the "clearly guilty" Williams looks as if he might literally get away with murder.