Morgan Seth Earp was an American sheriff and lawman. He served as Tombstone, Arizona's Special Policeman when he helped his brothers Virgil and Wyatt, as well as Doc Holliday, confront the outlaw Cochise County Cowboys in the Gunfight at the O.K. Corral on October 26, 1881. All three Earp brothers had been the target of repeated death threats made by the Cowboys who were upset by the Earps' interference in their illegal activities. The lawmen killed Cowboys Tom and Frank McLaury and Billy Clanton. All four lawmen were charged with murder by Billy's older brother, Ike Clanton, who had run from the gunfight. During a month-long preliminary hearing, Judge Wells Spicer exonerated the men, concluding they had been performing their duty.

Tombstone is a city in Cochise County, Arizona, United States, founded in 1879 by prospector Ed Schieffelin in what was then Pima County, Arizona Territory. It became one of the last boomtowns in the American frontier. The town grew significantly into the mid-1880s as the local mines produced $40 to $85 million in silver bullion, the largest productive silver district in Arizona. Its population grew from 100 to around 14,000 in less than seven years. It is best known as the site of the Gunfight at the O.K. Corral and presently draws most of its revenue from tourism.