Chris Bethel, an Iraq war veteran, was in Las Vegas for an IT conference and staying at the Mandalay Bay Resort when he heard gunshots just 2 floors up from his hotel room. He called the police, not knowing at that point that right above him a man was committing the deadliest mass shooting in modern US history, firing a hail of bullets onto a crowd at a nearby country music festival. "I crouched by my front door, in hopes that I might get the opportunity to see the shooter if he ran by and I could identify him," he told CBS News. Bethel's call would later help the police trace the shooter's location, where they found him dead from a self-inflicted gunshot wound.