Tyson makes his second appearance in the season five episode "Probable Cause", where he frames Castle for the murder of a young woman and plans to have his contacts in prison kill Castle as soon as he arrives after his arraignment. He also plants suggestive emails on Castle's computer with the intention of having Beckett believe Castle has been unfaithful to her. When Castle breaks out of custody and proves Tyson's involvement in the young woman's murder, Tyson confronts both him and Beckett on a bridge. Castle shoots Tyson, who falls into the water below. Police divers are unable to recover his body and he is formally listed as missing and presumed to be dead. Castle, however, believes that Tyson orchestrated the encounter to stage his own death in front of Beckett, whose account of events will be used to lend credibility to the belief that Tyson is dead.
