On November 14, 1882, gunslinger Franklin “Buckskin” Leslie shoots Billy Claiborne dead in the streets of Tombstone, Arizona. The town of Tombstone is best known today as the site of the infamous shootout at the O.K. Corral. In the 1880s, however, Tombstone was home to many gunmen who never achieved the enduring fame of Wyatt Earp or Doc Holliday. Franklin “Buckskin” Leslie was one of the most notorious of these largely forgotten outlaws.

There are few surviving details about Leslie’s early life. At different times, he claimed to have been born in both Texas and Kentucky, to have studied medicine in Europe, and to have been an army scout in the war against the Apache Indians. No evidence has ever emerged to support or conclusively deny these claims. The first historical evidence of Leslie’s life emerges in 1877, when he became a scout in Arizona. A few years later, Leslie was attracted to the moneymaking opportunities of the booming mining town of Tombstone, where he opened the Cosmopolitan Hotel in 1880. That same year he killed a man named Mike Killeen during a quarrel over Killeen’s wife, and he married the woman shortly thereafter.

Leslie’s reputation as a cold-blooded killer brought him trouble after his drinking companion and fellow gunman John Ringo was found dead in July 1882. Some Tombstone citizens, including a young friend of Ringo’s named Billy Claiborne, were convinced that Leslie had murdered Ringo, though they could not prove it. Probably seeking vengeance and the notoriety that would come from shooting a famous gunslinger, Claiborne unwisely decided to publicly challenge Leslie, who shot him dead. The remainder of Leslie’s life was equally violent and senseless. After divorcing Killeen in 1887, he took up with a Tombstone prostitute, whom he murdered several years later during a drunken rage. Even by the loose standards of frontier law in Tombstone, the murder of an unarmed woman was unacceptable, and Leslie served nearly 10 years in prison before he was paroled in 1896. After his release, he married again and worked a variety of odd jobs around the West. He reportedly made a small fortune in the gold fields of the Klondike region before he disappeared forever from the historical record.

Michael Thomas Barry is a columnist for CrimeMagazine.com and is the author of Murder and Mayhem 52 Crimes that Shocked Early California 1849-1949.