brutal murderer, even more dangerous than Dexter himself. Upon being released, he went underground, refining his ability to kill and taking on the identity of a plumber he killed (Rudy Cooper) as an alias, all while searching for his brother. Eventually, Brian not only discovered Dexter's location and history upon being separated, but also discovered he was similarly "damaged"; upon learning this, Brian immediately plotted to reunite with Dexter for the purpose of killing people side by side. Brian went to Miami, working as a prosthetist and murdering prostitutes as the "Ice Truck Killer". At some of his kills and at Dexter's apartment, Brian left clues to his and Dexter's past. Brian developed a relationship with Debra, Dexter's adoptive sister, while treating one of his own victims, Tony Tucci. As Debra fell in love with him, he used Debra as a means to get closer to Dexter. The week before Dexter was informed of the death of his biological father (Joseph Driscoll) and met Brian Moser for the first time, Brian disguised himself as a cable repair man and visited the house of the deceased man. At the end of the ninth episode of the first season, it was implied that Brian had murdered Joseph Driscoll while in disguise by injecting insulin. The body was cremated before Dexter could find any evidence of murder. Brian began slowly to show more of an interest in spending time with Dexter. When Brian talked to Dexter about possibly marrying Debra, he lied about a cut on his lip. He told Dexter it was a lab accident, but in reality he received the cut while attacking and nearly killing Angel Batista. This led Dexter to the realization that Brian was the Ice Truck Killer. Brian immediately kidnapped Debra, which led to the police suspecting his involvement in the Ice Truck Killer case. After searching Brian's apartment, Dexter tracked him down at the site of their childhood home, where Dexter recalled that they were brothers. Brian told Dexter his history after their separation, and tried to convince Dexter to kill Debra in the same manner that he killed his victims. Dexter refused, leading to a fight between the two as the police arrived. Brian escaped the house and disappeared. Brian later attempted to kill Debra when he thought she was staying at Dexter's apartment, but instead fell into a trap set by Dexter, who then