I happen to believe that it is at least possible that Wyatt did have something to do with Ringo's death, maybe even pulling the trigger himself. I remember the look on our late beloved friend Paul Cool's face when I expressed this viewoint in the Four Deuces Saloon in Tombstone at one TTR. It went from the look one has when speaking with a fellow serious researcher to the look when one is thinking, "My God, I didn't know he was one of them!". Never the less, here's my take from a previous thread, with some interesting info from other posters.
https://nediscapp.herokuapp.com/discussion.cgi?disc=39627&article=28887&page=0