Jeff Guinn discusses his book, "The Last Gunfight: The Real Story of the Shootout at the O.K. Corral - and How it Changed the American West." The book tells the history of an 1881 gunfight in Tombstone, Arizona that included Wyatt Earp and Doc Holliday. Mr. Guinn states that documents confirm that the gunfight did not take place at the O.K. Corral, but near it, and that blame for the gunfight is open to interpretation.