 Based on the life and exploits of an actual old west gunslinger  named John Ringo, a distant cousin of the outlaw Younger family. The  real Ringo was a ruthless murderer and survivor of the infamous  gunfight at the OK Corral, against (Dr.) John Holliday, Wyatt Earp,  and the Earp brothers. Also unlike the movies account, the actual  John Ringo 