Follow the trail of 'The Grim Sleeper' For more than two decades, a serial killer has stalked the streets and alleys of south Los Angeles. Police have linked 11 slayings through DNA and have the eyewitness account of a lone survivor of his attacks. But the killer's identity remains a mystery, and now police need your help in finding the man dubbed "The Grim Sleeper." Follow his trail in this CNN.com special presentation. Apr 01