Family feuds in the United States had occurred on October 26, 1881, and was itself the climax of the Earp–Clanton family feud, simmering since the summer of 1880. Tensions between the Earps and both the Clantons and McLaurys increased through 1881, culminating in the historic gunfight. At the O.K. Corral, three deputized Earp brothers, Wyatt, Morgan and Virgil, along with Doc Holliday, had killed Billy Clanton, Frank McLaury and Tom McLaury. The Clanton and McLaury families were aligned with the "Outlaw Cowboys", a loosely knit outlaw group of families, friends and acquaintances then living in surrounding Cochise and Pima counties. The Earp Vendetta ride was a
Gunfight at the O.K. Corral Behan surname through the end of that summer. She rented her home sometime before April 1881 to Dr. George Goodfellow. Wyatt Earp lived with Mattie Blaylock who was listed as his wife in the 1880 census, who had a growing addiction to the easily available opiate laudanum. Earp remained with Blaylock until he left Tombstone in April 1882. There are no contemporary Tombstone records that indicate a relationship between Marcus and Earp, but Earp certainly knew her, because both Behan and Earp had offices above the Crystal Palace Saloon. Sadie, traveling as either Mrs. J. C. Earp or Mrs. Wyatt