 Trehero passed away in 1986.According to a vision Trehero had experienced, in 1993 Tom Yellowtail conducted a blessing ceremony for James Trosper in order to pass authority for the Trehero Sun Dance for the Eastern Shoshone to Trosper.After attending a Crow Sun Dance led by Yellowtail in the Wolf Teeth ("Chetish") Mountains of Montana in 1993, Trosper led his first Eastern Shoshone Sun Dance in 1994, with assistance of Yellowtail from outside the Sun Dance lodge.