He is shown on findagrave.com as dying 9 June 1900. Thee's a photo of him and a grave plaque that unfortunately doesn't include dates. Search at http://www.findagrave.com/cgi-bin/fg.cgi?page=gs&
; (the URL for his page is too long to post)
Strangely, he's not listed on genealogy.az.gov, the AZ site that shows birth and death records linked to certs. In fact, there's only one death shown for Graham Co in 1900, so there's obviously some problem with the county's records for the year, or at least as they were provided to the state.
Hope this helps.