God Bless America! Big & Rich are completely "heartbroken" over the deadly Las Vegas shooting that claimed the lives of 59 people and injured 527. Big Kenny and John Rich, who opened for headliner Jason Aldean, performed at Sunday's Route 91 Harvest festival less than two hours before gunshots were heard. Tragically, the pair revealed a fan they met prior to their performance was killed when gunman Stephen Paddock opened fire on the festival crowd of more than 22,000 from his 32nd-floor hotel room at the nearby Mandalay Bay Resort and Casino, in what is now the deadliest mass shooting in modern U.S. history. "One guy that was in our meet-and-greet before the show, 25-year-old kid, passed away," Rich. "We had just met him before the show, but this bright-eyed kid was so excited to meet Big & Rich said. And he was one of the guys, you know just shook his hand a couple hours before that. It's unthinkable." The bandmates said they were still coming to grips with what had occurred.

The singers joined the show earlier to discuss how it all went down.