who disappeared 25 years earlier, she asks Dexter to analyze the remains, and tells him that she suspects Kurt of killing her. Dexter leads her toward investigating Kurt as a serial killer in hopes that exposing his crimes will destroy his influence over Harrison. She arrests Kurt for Iris' murder, but Kurt surprises her by saying that his late father, Roger, committed the crime. (A flashback reveals that Kurt did indeed kill her, however.) When Kurt is released, he tries to intimidate Dexter by hinting that he knows he killed Matt, and Dexter realizes that he will have to kill Kurt to protect Harrison and himself. Dexter arrives at Kurt's cabin just in time to save Harrison from Kurt, who runs off. He tells Harrison that they have the same "Dark Passenger", and for the first time truly bonds with his son. At first, Dexter tells Harrison that he merely "confronts" murderers to make them stop killing, but Harrison eventually figures out that Dexter kills his victims. Harrison reveals that he remembers seeing Mitchell kill Rita, and that he is filled with a violent rage all the time. He then says that Kurt deserves to die, and father and son set out to kill him. Together, they find Kurt's victims, including Park, perfectly preserved and displayed in a bunker underneath his house. Dexter intentionally triggers an alarm to let Kurt know they found his hiding place. As intended, Kurt rushes back to his house, where Dexter incapacitates him and prepares a kill site in Kurt's own bunker. When Kurt claims that he "saved" his victims from lives of pain and suffering, Dexter kills him as Harrison watches, and resolves to teach him "the Code of Harry". They return to Dexter's cabin to find that Kurt had burned it down the night before. They stay with Angela and Audrey, now Harrison's girlfriend, and start to bond as a family - until Angela finds evidence, left by Kurt, exposing Dexter as Matt's murderer. She then sees a connection between that proof and new evidence uncovered by Park on the Bay Harbor Butcher case, and realizes that Dexter is the killer. In the finale episode, "Sins of the Father", Angela arrests Dexter for Matt's murder. He flees the station after having contacted Harrison using the deputy Logan's phone. He meets up with Harrison and tells his son to leave town with him. Harrison