is on. He is later confronted by Dexter, who intends to kill him against Brother Sam's wishes. Nick asks for forgiveness, stating he had no choice. However, Nick realizes that the police have no evidence to tie him to the killing and subsequently gloats about how he got away with it. Dexter, initially willing to let him go, then goes ahead and kills him. Nathan Roberts (David Monahan): A jogger whom Travis Marshall kills and butchers to resemble the Four Horsemen of the Apocalypse. Dr. Michelle Ross (Rya Kihlstedt): a therapist who the police department assigns to Debra after she is involved in a shooting. During their sessions, Debra starts to believe that she is in love with Dexter. Professor Carissa Porter (Mariana Klaveno): Professor Gellar's former assistant who provides Miami Metro with insight into their prime suspect in the "Doomsday Killers" case. Quinn has a brief affair with her. Holly Benson (Lacey Beeman): a would-be victim of the "Doomsday Killers" whom Travis released because he was questioning the morality of their acts. When Travis acknowledged that Gellar was no more than a figment of his imagination and hence completely responsible for the Doomsday Killings, he tracks down Benson and kills her to clean up "a mistake". Steve and Beth Dorsey (Kyle Davis and Jordana Spiro): a fanatically religious couple who team up with Travis to kill Holly Benson. Dexter kills Steve, mistaking him for Travis. Beth is later dispatched to Miami Metro by Travis to release Wormwood as a poison gas. Dexter, realizing her plans, locks her in an interrogation room just as she releases the gas, making her its only victim. Minor characters in season 7 Wayne Randall (Daniel Buran): A man who went on a killing spree but was imprisoned for life after his accomplice, Hannah McKay, agreed to help the police incriminate him. Randall agrees to help the police find bodies of his victims, though he soon commits suicide. Dexter suspects it was just a ploy to get a few more days of "sunshine and frosty swirl" (ice cream) before his death. Ray Speltzer (Matt Gerald), was suspected of two murders, and whom Dexter believed would most likely kill again. Dexter investigated him further noting that he had access to a mausoleum at the cemetery where he worked. Dexter found proof of Speltzer's guilt inside it. Speltzer bought a girl home to his place and killed