Let's see...grew up being boyhood friends of HOF Pete Browning. Played semi-pro ball before being recruited to join the newly founded American Association. Was a solid hitter who had a magical 1890 season leading the league in BA. Due to an argument with his manager, he successfully got him fired and took over as manager and then lead the first players strike in major league baseball history. Post baseball, he became a firefighter and due to a horrible firefighting accident, wound up in the Central Asylum for the Insane where he passed away at a young age.
It might be a tearjerker at the end, but would certainly be an interesting period movie and one heck of a slice of life film.
http://sabr.org/bioproj/person/3f8eac9e