From AOL News: LOS ANGELES (Feb. 25) – They have a sample of his DNA, a description from a survivor and a $500,000 reward, but detectives investigating the city’s most notorious serial killer have hit a wall. On Wednesday, they released a recording of a 1987 emergency call in hopes of tracking down the man dubbed the “Grim Sleeper,” who has killed at least 11 times in nearly a quarter century. “It’s a...