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Shaun Decker is a Character in Season Eight of DEXTER. A hormone driven murderer, he strangled a girl which he claims was an "accident", during a sexual encounter then went on to brag about it with no remorse. He went to High School with Zach Hamilton, who unfortunately for Shaun, learned about the murder and would later target him as a potential victim.
Zach was a budding serial killer, tutored by Dexter Morgan with the Code of Harry and learned what to look for in a potential victim. With Zach's urges growing stronger, he followed through with the Code's guidelines and tracked someone from his past that he felt deserved it - Shaun Decker. He spent a few days tracking Shaun, taking pictures of him with women and set up his motel room as a Kill Room fully wrapped in plastic. Zach tracks down Shaun, intending to knock him out however he doesn't go down after the first blow so he continues to hit him until he ends up dying and he shoves the body in his car.
Meanwhile, Dexter arrives in the Keys where he figured out Zach was and intends to kill him (believing Zach strayed outside the Code and killed an innocent girl by the name of Cassie Jollenston). After his encounter with Zach, he learns that he didn't kill Cassie and instead scolds him about what happened with Shaun, agreeing to help get rid of the body while Hannah McKay (who arrived with Dexter) deals with the kill room.