After spending time in prison from 1894-1896 for stealing horses, he organized a group of outlaws known as the Wild Bunch. The most famous member of this group was Harry Longabaugh, also known as The Sundance Kid. The Wild Bunch robbed over a dozen banks and trains from 1896 to 1901. In 1901, Cassidy and Sundance fled to New York City, then Argentina, resuming their careers as both ranchers and outlaws in South American countries, including Argentina and Bolivia. They were killed by soldiers in Bolivia in 1908 or 1909.
There were rumors that the two survived and lived out the remainder of their lives in Uruguay or back in the United States under assumed names, but they are generally regarded to be false. The duo was portrayed in a popular 1969 movie, Butch Cassidy and the Sundance Kid, starring Paul Newman and Robert Redford.
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