Butch Cassidy and the Sundance Kid were two of the most famous outlaws of the Old West

They were members of the Wild Bunch, a gang of outlaws who robbed banks and trains throughout the western United States and Mexico.

Cassidy was born Robert LeRoy Parker in Beaver, Utah, in 1866. He grew up in a poor family and left home at a young age to become a cowboy. 

Sundance was born Harry Alonzo Longabaugh in Montpelier, Wyoming, in 1867. He also grew up in poverty and left home at a young age to become a cowboy.

The two men met in Telluride, Colorado, in 1889. They quickly became friends and partners in crime. 

They joined the Wild Bunch and participated in a number of robberies, including the robbery of the Union Pacific Overland Flyer in 1899.

The Wild Bunch became increasingly successful, but they also became increasingly wanted by the law. In 1901, they decided to flee to Bolivia. 

They hoped to start a new life there, but they were eventually tracked down by the Bolivian army.

In 1908, Cassidy and Sundance were ambushed by the Bolivian army. 

Sundance was killed in the shootout, but Cassidy was able to escape. He was never seen or heard from again.

The relationship between Butch Cassidy and the Sundance Kid was one of close friendship and mutual respect. They were both skilled outlaws and they were able to work together effectively. They were also both known for their sense of humor and their love of adventure.

The end of Butch Cassidy and the Sundance Kid is shrouded in mystery. 

Some believe that Cassidy escaped to Argentina and lived a long and happy life. 

Others believe that he was killed in Bolivia. The truth may never be known.

However, the legend of Butch Cassidy and the Sundance Kid continues to live on. They are two of the most iconic outlaws of the Old West and their story has been told and retold in books, movies, and television shows.