Mr. Horn

Mr. Horn is a 1979 madeforTV movie chronicling the life of Tom Horn. It was directed by Jack Starrett from a screenplay by William Goldman.

Tom Horns life is covered from his early days as an army scout, to his time as a Pinkerton agent, concluding with the events surrounding his death by hanging in 1903.Comparing this movie to documented history shows many factual errors. Karen Blacks character of Ernestina Crawford, sister to Emmet Crawford in the movie, was completely fictitious. General Crook appears in the movie after the point he historically died. ........

Source: Wikipedia