Known as a lawman, a detective, and one of the most notorious killers in the West, Tom Horn was hired by the famous Pinkerton Detective Agency as a tracker and bounty hunter. However, after 14 years of service, he was forced to resign after it was discovered he was connected to the murders of 17 people. Following his years with Pinkerton, Horn became known as a hired assassin and was accredited to the deaths of 20 some-odd cattle rustlers over the next few years. After he was found to be connected with the death of a 14-year-old boy (some say Horn was the one who killed him, others disagree), Horn was sentenced to death by hanging.