Who was Harry Longabaugh better known as?

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. He likely met Butch Cassidy (real name Robert Leroy Parker) after Parker was released from prison around 1896. Together with the other members of "The Wild Bunch" gang, they performed the longest string of successful train and bank robberies in American history.

After pursuing a career in crime for several years in the United States, the pressures of being pursued, notably by the Pinkerton Detective Agency, forced Longabaugh, his girlfriend Etta Place, and Cassidy to leave the United States. The trio fled first to Argentina and then to Bolivia, where Parker and Longabaugh were reportedly killed in a shootout in November 1908.

At age 15, he traveled westward in a covered wagon with his cousin George. In 1887, Longabaugh stole a gun, horse and saddle from a ranch in Sundance, Wyoming. While attempting to flee, he was captured by authorities and was convicted and sentenced to 18 months in jail by Judge William L. Maginnis. During this jail time, he adopted the nickname of the Sundance Kid.