The man suspected in the "Grim Sleeper" slayings of 10 women has pleaded not guilty before a Los Angeles judge. FILE - In this July 8, 2010 filer photo, Lonnie David Franklin Jr. appears for arraignment on multiple charges as the alleged "Grim Sleeper" killer, in Los Angeles Superior Court. Franklin is expected to plead not guilty to the ten charges of murder on Monday Aug.