‘Grim Sleeper’ Serial Killer Found Guilty of Murdering 10 Black WomenStephen A. Crockett Jr.5/06/16 8:47amFiled to:NewsLonnie Franklin Jr., dubbed the “Grim Sleeper” for a 14-year break in his string of 10 murders from the 1980s to the early 2000s.AL SEIB/AFP/Getty ImagesAdvertisementNew update