Harry Alonzo Longabaugh (1867 – November 7, 1908), better known as the Sundance Kid, was an outlaw and member of Butch Cassidy's Wild Bunch in the American Old West.

[citation needed] Longabaugh fled the United States along with his consort Etta Place and Butch Cassidy to escape the dogged pursuit of the Pinkerton Detective Agency.

[4] Longabaugh drifted to the Black Hills before turning back to try to find work again at the N Bar N.[5] In 1887, while traveling across the Three V Ranch near Sundance, Wyoming, he stole a gun, horse, and saddle from a cowboy.

He adopted the nickname "Sundance Kid" during this time in jail, having derived it from the Wyoming town of the same name and the fact that he left home at the age of 15.

[9] Longabaugh and Logan used a log cabin at Old Trail Town in Cody, Wyoming, as a hide-out, as they planned to rob a bank in Red Lodge, Montana.

[9] Cassidy and Longabaugh fled to New York City, feeling continuous pressure from the numerous law enforcement agencies pursuing them and seeing their gang falling apart.

[15] Two English-speaking bandits held up the Banco de Tarapacá y Argentino in Río Gallegos on February 14, 1905, 700 miles (1,100 km) south of Cholila near the Strait of Magellan, and the pair vanished north across the Patagonian grasslands.

Governor Julio Lezana issued an arrest warrant, but Sheriff Edward Humphreys, a Welsh-Argentine who was friendly with Cassidy and enamored of Place, tipped them off.

The trio then fled north to San Carlos de Bariloche, where they embarked on the steamer Condor across Nahuel Huapí Lake and into Chile; they returned to Argentina by the end of the year.

[17] Cassidy, Longabaugh, Place, and an unknown male associate robbed the Banco de la Nación Argentina branch in Villa Mercedes, San Luis Province on December 19, 1905, which is 450 miles (720 km) west of Buenos Aires, taking 12,000 pesos.

Cassidy obtained honest work under the alias James "Santiago" Maxwell at the Concordia Tin Mine in the Santa Vera Cruz range of the central Bolivian Andes, where Longabaugh joined him upon his return.

The soldiers, the police chief, the local mayor, and some of his officials all surrounded the lodging house on the evening of November 6, intending to arrest the Aramayo robbers.

The local police report speculated that judging from the positions of the bodies, Cassidy had probably shot the fatally wounded Longabaugh to put him out of his misery, then killed himself with his final bullet.

Snow's search formed the basis of the British documentary Wanted - Butch Cassidy and the Sundance Kid (Channel 4, April 22, 1993; later screened on Nova, October 12, 1993).