On Oct. 1, 2017, Jason Aldean was starting to sing his hit song, "When She Says Baby," at the Route 91 Harvest Festival in Las Vegas when an unfamiliar sound started to fill the venue.
Thousands of concertgoers, including Cal Fire/Riverside County Fire Department firefighter Chris Wetzel, thought the rapid-fire popping sounded like firecrackers. A gunman holed up in a nearby hotel room had begun shooting into the crowd.
Aldean, who was still on stage, suddenly stopped singing and left the stage frantically. The screens behind him went dark. The concert was over, but what was beginning to unfold was something no one, particularly the crowd of 22,000 country music fans, was expecting.
The first round of gunfire, Wetzel recalled, sounded like it was coming from the Las Vegas Strip. Moments later, he looked over and saw a woman lying dead about 10 feet in front of him.