The Only “Real “ Earp in Tombstone. #Tombstone #WyattEarp #DocHolliday #mostfamouschallenge. a real Earp descendant, Glen Wyatt Earp (also known as Wyatt Earp III), appeared in the film playing the outlaw Billy Claiborne, a distant cousin of the famous lawman, adding a unique connection to the Earp family history | Jeff Schreckler