The Deadliest Serial Killer of the Wild West

In the lawless frontier of the Old West, a hidden evil lurked behind a friendly inn. Polly Bartlett, known as the "Murderess of Slaughterhouse Gulch," is said to have used arsenic to poison up to 22 unsuspecting travelers at her family's inn in South Pass City, Wyoming. Some say it is legend. Others insist it is true. What is certain is that the Wild West was home to some of history's deadliest killers, including John Wesley Hardin, who claimed 42 kills, and Bill Longley, who allegedly murdered at least 32 men across several states. These were not romantic outlaws—they were ruthless murderers who left trails of victims across the frontier.