A tarot card left at a crime scene became the fatal mistake that exposed the DC snipers. This is how it happened. Imagine stepping outside, terrified you might be next. During the 2002 Beltway sniper attacks, police were baffled until finding a cryptic secret message. This one note changed everything. Intended to taunt authorities, it unraveled John Allen Muhammad and Lee Boyd Malvo. And if you want to go deeper, watch Malvo's confession right now.