At Deb's request, Batista locates Arlene Schramm, the witness who saw Hannah McKay kill a counselor in a halfway house. When Deb blacks out and has a car accident, she thinks she knows who might have been responsible. Dexter learns that the last of the men who killed his mother, Hector Estrada, is up for parole but has no objection as he has his own plans for the killer. Matthews has a chat with Dexter and tells him of Captain LaGuerta's theory about him being the Bay Harbor Butcher. Dexter is quick on his feet and Matthews believes him when he denies it all. When ...