William E. "Bronco Bill" Walters (1869 – June 16, 1921) was an outlaw during the closing days of the Old West.
He began riding with the Black Jack Ketchum Gang around 1893, where he is believed to have committed at least two murders.
Between 1894 and 1897, Walters robbed an undetermined amount of cash from shipments, committing several murders in the process.
However, as the legend goes, Walters began hiding his loot in a secret location around Solomonville, near where he and his gang had their hideout.
Walters was released from prison in 1917, and although it is not known for certain, he is believed to have never returned to Solomonville, possibly because there was, in reality, no "lost treasure" to recover.