Butch Cassidy refers to Robert LeRoy Parker, a famous American outlaw and the leader of the Wild Bunch, a gang active in the late 19th century American West. He is best known for train and bank robberies and for his partnership with the Sundance Kid. Key points:

• Identity: Born in 1866 in Beaver, Utah; later became known as Butch Cassidy.
• Activities: Led the Wild Bunch, planning and executing robberies across multiple Western states.
• Legacy: The duo of Cassidy and the Sundance Kid became iconic figures in Western folklore and popular culture, including the 1969 film Butch Cassidy and the Sundance Kid.
• Death: There is historical uncertainty surrounding his death; many accounts place Cassidy and Sundance Kid in Bolivia in 1908, though exact details remain debated.

If you’d like, I can tailor this to a specific aspect (biography, notable crimes, the Wild Bunch members, or how the story has been depicted in film and literature) and provide more depth with dates, locations, and notable robberies.