Thomas "Tom" Horn, Jr. (November 21, 1860 - November 20, 1903) was an American Old West scout, who carried out varied roles as hired gunman, Pinkerton, range detective, cowboy, and soldier. Believed to have committed 17 murders as a hired gunman in the West, in 1902 Horn was convicted of the murder of 14-year-old Willie Nickell near Iron Mountain, Wyoming. The boy was the son of sheep rancher Kels Nickell, who had been involved in a range feud with...