Brian Moser, aka The Ice Truck Killer, (born 17 July 1968) is a character in the Showtime series DEXTER. He is the first main antagonist in the series, and one of Debra Morgan's lovers. Living under the alias of Rudy Cooper, Brian begins a strange killing spree. When police find the bodies of several dismembered and bloodless prostitutes, they initiate a difficult investigation, not realizing that the killer is hiding in plain sight. During the debut's season finale, Brian is revealed to be Dexter Morgan's biological older brother and the son of Joe Driscoll and Laura Moser.