As the deadliest mass shooting in modern U.S. history unfolded in Las Vegas Sunday night, hundreds of concertgoers like Heather Gooze were forced to watch strangers die right before their eyes. Gooze held one victim in her arms as he took his final breaths. To reach his loved ones, she turned to Siri and Facebook, she told CNN. Gooze was there to comfort 23-year-old Jordan McIldoon for hours as he died from gunshot wounds at the Route 91 Harvest music festival in Vegas, People reported.