The Sundance Kid, born Robert Leroy Parker in 1867, was an American outlaw and member of the infamous Wild Bunch gang. He gained notoriety for his involvement in bank and train robberies during the late 19th century, particularly in the American West. His partnership with Butch Cassidy made them one of the most famous criminal duos of their time. The Sundance Kid was known for his exceptional marksmanship and quick escape tactics. After a series of successful heists, he fled to South America with Cassidy to evade law enforcement. Their story has been romanticized in films, notably in the 1969 movie Butch Cassidy and the Sundance Kid.