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Arthur C. McCoy (1825-1880?) – Born in Ireland in 1825, McCoy immigrated to the United States, first settling in California during the gold rush. However, by the 1850s he was living in St. Louis, Missouri, where he worked as a coppersmith. In 1855, he married Louisa Gibson and the couple would eventually have five children. He then formed a partnership and started a painting business called “Farmer and McCoy.” During the Civil War, he became a captain under Confederate General Jo Shelby and was said to have worked as a spy. After the war, he became involved with the James-Younger Gang and was thought to have been involved in several robberies as well as killing a Pinkerton Agent named Joseph Whicher in 1874. He then moved his family to Texas, where he began working as a rancher. He was thought to have died in around 1880.
“One-Legged Jim” McCoy – An outlaw, he killed Sheriff Charles McKinney in La Salle County, Texas and was hanged in San Antonio in 1887.
J. McDaniels – Outlaw member of the Pitts-Yeager Gang, he was killed in 1884 in Texas.
William “Bud” McDaniels – An outlaw and former Quantrill’s Raider during the Civil War, he rode with the James Gang.
J. McDonald – A gunman, he shot and killed his friend Robert Taylor on January 13, 1890, in Clayton, New Mexico.
Walter McDonald – A gunman, he shot Thomas Richards in 1884 in Coeur de’Alene, Idaho.
Annie McDougal (or McDoulet), aka: Cattle Annie – An outlaw, at eighteen, associated with the Doolin Gang and was suspected of stealing livestock and selling whiskey. Steve Burke captured her and Bill Tilghman caught her partner Little Britches and they were sent to reform school.
Orpheus McGee (18??-1876) – Orpheus McGee shot and killed Robert Alexander on April 20, 1874, in Oklahoma. He claimed that Alexander had murdered a friend of his and the shooting was out of revenge. He was hanged at Fort Smith, Arkansas on April 21, 1876.
Patrick McGowen – Though McGowen claimed self-defense in the killing of a man in Oklahoma, he was found guilty of murder and hanged at Fort Smith, Arkansas on September 9, 1881.
James McIntire (1846-1902) – A Texas gunman and lawman from 1860, he was a Texas Ranger, city marshal of Las Vegas, New Mexico, deputy sheriff, cowboy, hunter, gambler, and outlaw with a $1,000 reward on his head for the deaths of two men near Silver City, New Mexico.
Amos McIntosh – Said to have killed U.S. Deputy Marshal Lee Atkins, McIntosh was arrested by Grant Johnson.
William J. McGrew – McGrew might have been a hero but instead turned out to be a scalawag. Author Sue Moore tells the story of his demise in Montgomery Texas.
Robert McKemie, aka Little Reddie (18??-??) – Outlaw member of the Sam Bass Gang, who rant with them in the Dakotas in the 1870s.
M. “Red” McLaughlin – An outlaw robber, he escaped jail in Springer, New Mexico on July 4, 1884.
Tom McLaury (1853-1881) – A member of the Clanton Gang, he was one of the three cowboys killed by the Earps in the Gunfight at the O.K. Corral on October 26, 1881.
Irving McManus – An outlaw, he rode with the Black Jack Ketchum gang in the 1890s.
Bill McNew – A gunman and accused rustler, he fought with Oliver Lee in the Lee-Good feud in Tularosa, New Mexico.
Martin McRose – An outlaw, he rustled cattle and was killed by EI Paso city marshal Jeff Milton.
John Medlock – An outlaw, he was hanged on May 25, 1906, in Raton, New Mexico.
Henry Wilbur “Bob” Meeks – An outlaw member of the Wild Bunch, he was imprisoned in the 1900s. He died in an insane asylum on November 22, 1912, in the State Hospital in Evanston, Wyoming.
Augustus “Gus” Menczer (1856-1882) – A gunman and saloon owner, he killed several men after a shoot-out with his business partner in Raton, New Mexico in 1882. A mob lynched him on June 28, 1882.
Nica Meras – An outlaw, he stole horses in Lincoln County, New Mexico and was shot in 1877.
Charles Merideth – An outlaw, he killed “Red” Dent Kyes in Clayton, New Mexico in March 1890
David Merrill – An Oregon outlaw, Merrill rode with Harry Tracy who killed him in 1899, after a prison escape.