Tom Horn: The Hired Killer Who Talked Himself Onto the Gallows

On November 20th, 1903, Tom Horn was hanged in Cheyenne, Wyoming, for shooting a fourteen-year-old boy in the back. He had been an Army scout, a Pinkerton agent, and a hired gun for Wyoming's cattlemen, and almost nobody doubts he killed men for money. So why was he hanged for the one killing no one could ever prove he did?