Lonnie David Franklin Jr. (August 30, 1952 – March 28, 2020), better known by the nickname Grim Sleeper, was a convicted American serial killer. He was responsible for at least ten murders and one attempted murder in Los Angeles, California. He was also convicted for rape and sexual violence. Franklin earned his nickname when he appeared to have taken a 14-year break from his crimes, from 1988 to 2002.