Here's how the tale goes -- Butch Cassidy and his pal the Sundance Kid were killed in a shootout with the Bolivian cavalry in 1908. But now there is a story that not only did Cassidy not die, he lived on for another 30 years and wrote an autobiography about his exploits.
Fox News reports that a Utah book collector named Brent Ashworth has obtained a rare 1934 manuscript called "Bandit Invincible: The Story of Butch Cassidy." This is not the first manuscript to bear this title. A previously known one was written by a fellow named William T. Phillips, a man who lived in Washington state and died in 1937.
Ashworth claims Phillips and Cassidy were the same person. He says the manuscript contains information that only Cassidy himself would know.
However, Phillips wrote that he had known Cassidy since boyhood. After he died, Phillips' widow said they both knew Cassidy, and that her husband was not the legendary outlaw.
Their adopted son, though, thought his dad was indeed Cassidy.
At least one Cassidy historian thinks the book was not written by Cassidy.
"Total horse pucky," said Dan Buck. "It doesn't bear a great deal of relationship to Butch Cassidy's real life, or Butch Cassidy's life as we know it."
Buck said he dug up a grave in Bolivia in 1991 that supposedly held Butch and Sundance's remains. DNA testing showed they were not the outlaws, however Buck said his research shows they were killed in that shootout.
Phillips was cremated, so there can be no DNA testing on his remains.
There were various reports of Butch and Sundance sightings over the years, but they were never confirmed.