Newman Haynes Clanton, also known as "Old Man" Clanton, was a cattle rancher and father of four sons, one of whom was killed during the Gunfight at the O.K. Corral. Two of his sons were involved in multiple conflicts in Cochise County, Arizona Territory including stagecoach robbery and cattle rustling. His son Ike Clanton was identified by one witness as a participant in the murder of Morgan Earp. Billy Clanton and Ike were both present at the Gunfight at the O.K. Corral in which Billy was killed. "Old Man" Clanton was reportedly involved with stealing cattle from Mexican ranchers and re-selling them in the United States. Records indicate he participated in the Skeleton Canyon Massacre of Mexican smugglers. In retaliation, Mexican Rurales are reported to have ambushed and killed him and a crew of Cowboys in the Guadalupe Canyon Massacre.

The gunfight at the O.K. Corral was a gunfight that lasted less than a minute between lawmen led by Virgil Earp and members of a loosely organized group of outlaws called the Cowboys that occurred at about 3:00 p.m. on Wednesday, October 26, 1881, in Tombstone, Arizona Territory, United States. It is generally regarded as the most famous gunfight in the history of the American Old West.