The first season of Dexter is an adaptation of Jeff Lindsay's first novel in the Dexter series, Darkly Dreaming Dexter. Subsequent seasons have featured original storylines. This season aired from October 1, 2006 to December 17, 2006, and follows Dexter's investigation of "The Ice Truck Killer". Introduced in the first episode, "Dexter", this serial killer targets prostitutes and leaves their bodies severed and bloodless. At the same time, Dexter's foster sister, Debra Morgan (Jennifer Carpenter), a vice squad officer, aspires to work in the homicide department, and Dexter's girlfriend, Rita Bennett (Julie Benz), wants their relationship to be more intimate. Christian Camargo appears as Rudy Cooper and is a recurring character until the end of the season.