The Servant Girl Murders were one America’s earliest serial killings, predating Jack the Ripper by three years.
In 1948, a corpse was found on a beach in Adelaide, Australia. His identity, and how he died, remains a mystery.
In 1964, a Ku Klux Klan “hit squad” rode into Ferriday, Louisiana and set Frank Morris on fire. Nearly a half-century later, one of the alleged participants is still a free man.
In 1982, seven people ingested Tylenol sprinkled with a fatal dose of cyanide. The case has never been solved.