Through Debra, Rudy tries to get closer to Dexter. Dexter comes first to realize that Rudy killed Joe, and later affirms that he is the Ice Truck Killer. With his identity blown, Rudy kidnaps Debra and draws Dexter into a trap to rescue her. Rudy reveals to Dexter that he is his older brother Brian Moser, also left in the shipping container when Laura was killed. However, unlike Dexter, he was sent off to live in series of mental institutions. Brian too has developed serial killer tendencies, but did not have the morals that Harry instilled in Dexter, and used the Ice Truck Killer approach to help Dexter recall his past. Brian suggests to Dexter they kill Debra together, but Dexter refuses. Brian gets away after a fight, and Dexter rescues Debra.
who was the ice truck killer on dexter
Brian Moser