Billy Breakenridge
William Milton Billy Breakenridge December 25, 1846 January 31, 1931 was an American lawman, teamster, railroader, soldier and author. He was assistant Tombstone City Marshal in the Arizona Territory when the Gunfight at the O.K. Corral took place.
Breakenridge was born in Watertown, Wisconsin to George D. and Elisa Ann Breakenridge. United States Census records from 1850 and 1860 indicate that he had an older brother, an older sister, and a younger sister.
Source: Wikipedia