For 23 days in October of 2002, the more than five million people living across the region known as the Washington DC Beltway lived in fear for their lives. They had a right to be. Somebody was shooting at them as they went about their daily routines, gassing up their cars, waiting for a bus, going shopping and just relaxing outside on a bench. It would change the behavior of thousands - you’d see them running zigzag patterns across parking lots to the safety of indoor shelter. Others would sit slumped down in the driver seat of their cars after locking the gas pump nozzle to hands-free, hoping that they would be concealed from the killer's sights. At first, it seemed as though the killer or killers were ghosts, that is until they began to regularly engage with and taunt the investigators with their demands. Law enforcement responded with dogged determination. It ended with the capture of an unlikely duo of stone-cold killers -- but not until 10 innocent people would die and 3 more would be seriously injured. Watch and listen to retired ATF Special in Charge, Mike Bouchard, one of the operation’s senior commanders, take you inside what has been called the largest manhunt ever conducted in the United States.