William Kessler Sapp (born William Kessler Lilly; March 22, 1962) is an American serial killer and rapist who committed the murders of three women and girls in the Springfield, Ohio area from 1992 to 1993, the attempted murder of another, and possible fourth murder in Florida. Sapp was detained for the murders only in 1996, after already being imprisoned for an earlier rape. He was sentenced to death on October 21, 1999, and is currently awaiting execution at the Chillicothe Correctional Institution.