Fitzsimmons knocked Sharkey cold in the eighth round, whereupon Earp disqualified Ruby Bob. When Bob protested, Wyatt pulled a gun on him!
It is widely believed that Earp had gambled heavily on Sharkey winning. In a later fight Fitzsimmons knocked Sharkey out in 2 rounds. There is no other record of Earp refereeing a fight, but he did become a boxing journalist.
