The gunfight at the O.K. Corral has excited the imaginations of Western enthusiasts ever since that chilly October afternoon in 1881 when Doc Holliday and the three fighting Earps strode along a Tombstone, Arizona, street to confront the Clanton and McLaury brothers. When they met, Billy Clanton and the two McLaurys were shot to death; the popular image of the Wild West was reinforced; and fuel was provided for countless arguments over the characters,...