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.

The gunfight at the O.K. Corral was a gunfight that lasted less than a minute between lawmen led by Virgil Earp and members of a loosely organized group of outlaws called the Cowboys that occurred at about 3:00 p.m. on Wednesday, October 26, 1881, in Tombstone, Arizona Territory, United States. It is generally regarded as the most famous gunfight in the history of the American Old West.