22 thousand fans are in Las Vegas for a life-affirming celebration of country music. Headliner Jason Aldean launches into his first set. Then the gunfire starts.

A deluge of 911 calls. Are there multiple shooters on the Las Vegas strip? So many wounded, so many killed. Las Vegas Metro PD has officers down.

At overwhelmed local hospitals, doctors triage the wounded, concentrating resources on treating those most likely to survive. The lobby of the Tropicana Hotel looks like a disaster zone strewn with concertgoers seeking shelter.

Country music artist Dee Jay Silver reunites with his infant son who was in a hotel room with his babysitter on the same floor as the shooter. Flash forward and it's now been five years since that night.