William Dathan Holbert (born September 12, 1979), alias William Adolfo Cortez and nicknamed "Wild Bill", is an American serial killer/hitman. Originally from North Carolina, he is currently serving a 47-year sentence for the killings of five Americans in Panama.

Gerald Eugene Stano (born Paul Zeininger; September 12, 1951 – March 23, 1998) was an American convicted serial killer. Stano murdered at least 23 young women and girls, confessed to 41 murders, and the police say the number of his victims may be closer to 88.

Ferdinand Gamper (12 September 1957 – 1 March 1996), known as The Monster of Merano, was a serial killer in South Tyrol, Italy. He killed six people in Merano during 1996, before he died.

Clayton Anthony Fountain (September 12, 1955 – July 12, 2004) was an American federal prisoner, member of the Aryan Brotherhood, and a convicted murderer.