The Sun Hill Serial Killer was a major storyline from the ITV police procedural drama The Bill. They were known on screen as the "River Murders", due to the bodies being left on the banks of the River Thames. The storyline spanned several months, from July 2002 to January 2003, with cast regular Cass Rickman (played by Suzanne Maddock), killed off at the denouement in December 2002. It also served as the exit storyline for DC Duncan Lennox, who transferred from Sun Hill Police Station to the Murder Investigation Team during the plot. The storyline concluded with the killer's capture in 2003 after they kidnapped Acting DI Samantha Nixon. It was the first of several serial killer storylines in the show.[1]