Sherman McMaster (1853–1892) was an outlaw turned lawman, who was one of the six men involved in the Earp vendetta ride.
In Tombstone, City Marshal Virgil Earp knew that McMaster was wanted for the robbery, but according to The Tombstone Epitaph Virgil had received instructions from Pima County Sheriff Bob Paul to wait to arrest McMaster until Diehl was in custody.
[2] On September 10, 1881, Tombstone City Marshal Virgil Earp attempted to arrest McMaster, who resisted.
He had, by all accounts, previously met and become friends with Wyatt Earp and Doc Holliday in Dodge City, Kansas.
Wyatt Earp claimed in the Flood manuscript that McMaster had been killed in 1898 in the Philippines while serving as a soldier in the Spanish–American War.
He was played by Monte Markham in 1967's Hour of the Gun, Markham’s feature-length movie debut, in which the character is the sheriff of a neighboring county recruited by Wyatt Earp into the posse (historically inaccurate); by Todd Allen in Wyatt Earp (1994), where he is a Tombstone deputy marshal working for Wyatt and Virgil; and by Michael Rooker in the 1993 film Tombstone, where he is a member of the Cowboys who joins Earp's posse after quitting the gang in disgust.