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Utah Woman Solves the Mystery of What Really Happened to Butch Cassidy and the Sundance Kid

On Saturday, May 20 from 10 a.m. - 5 p.m., Marilyn Grace will discuss her research and sign books at the McQuarrie Memorial Museum (145 North 100 East) in St. George, Utah.

The official version of the story says that legendary outlaws Butch Cassidy and the Sundance Kid fled to South America, where they were gunned down in a shootout with the Bolivian Army in 1908. But Marilyn Grace made headlines in 2009 when her team dug up a grave in Utah's Duchesne City Cemetery, hoping to prove that William Henry Long was, in fact, the Sundance Kid. DNA obtained along with Marilyn’s extensive research ultimately proved that he died in 1936, a Utah rancher with a shady reputation and a mysterious past.  

Marilyn now plans to make headlines again as she searches for Butch Cassidy’s grave. Marilyn and her team are currently in Utah doing research and filming a documentary about discovering what they believe to be Butch Cassidy’s grave at the Parker Ranch in Little Dog Valley. The documentary will take viewers on a journey through the process of locating the grave and ultimately obtaining the DNA evidence to solve the mystery once and for all.

A native of Utah, Marilyn Grace has spent the last 20 years searching for the truth about what really happened to Butch Cassidy and the Sundance Kid. Her first book, "Finding Butch Cassidy & The Sundance Kid," co-written by John McCullough, Pd.D., was released in 2015. With the release of her latest book, "Butch Cassidy: Mormon Boy Dies in Utah,” Marilyn expands on her research and solves the greatest outlaw mystery of all time. Both books are available now at Amazon and wherever book are sold.

On Saturday, May 20 from 10 a.m. - 5 p.m., Marilyn Grace will be at the McQuarrie Memorial Museum (145 North 100 East) in St. George, Utah, signing copies of her books  and discussing her research. The event is free and open to the public, and her books will be available for sale. For more information, visit


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