Oh, okay. I thought you mistook Kevin Costner for Kevin Conroy in this instance. I thought you were referring to the wild west town of Tombstone, which had the famous gunfight at the OK Corral featuring Wyatt Earp, who was played by Kevin Costner in... Wyatt Earp.
Though there was also the movie Tombstone that came out around the same time, which featured Kurt Russell as Wyatt Earp.