Wyatt Earp

Wyatt Earp is a 1994 Western film, written by Dan Gordon and Lawrence Kasdan and directed by Kasdan. The semi-biographical film starred Kevin Costner as lawman Wyatt Earp. Other members of the all-star cast included Dennis Quaid, Gene Hackman, Mark Harmon, Michael Madsen, Joanna Going, Tom Sizemore, Bill Pullman, JoBeth Williams, Linden Ashby, and Mare Winningham. It's rated PG-13 for strong gunfights, some language and sensuality.

Wikipedia: Wyatt Earp (film)

I suggest you see it.