I saw a movie about him...don’t recall the title but Tony Curtis played Hayes.
When this movie was about to come out, there was a TV special shown with Lee Marvin playing Ira Hayes.
In the movie, Hayes (Curtis) dies due to exposure on a frost covered mountain. In the TV show, Hayes (Marvin) die falling drunk into an almost empty irrigation ditch.
“The Outsider” 1961
https://www.imdb.com/title/tt0055270/
Full movie is on Youtube for free.
https://www.youtube.com/watch?v=fH_5gPaHCuk