Richard William Davis (November 7, 1941 – August 24, 2012) was an American child murderer, rapist and possible serial killer who was posthumously linked via DNA to the abduction and murder of 5-year-old Siobhan McGuinness, who was found raped and strangled near Turah, Montana on February 7, 1974. Davis had never been convicted or considered a suspect in any violent crime during his lifetime. He died of natural causes in 2012.