LAS VEGAS, NV - OCTOBER 3: A makeshift memorial for the victims of Sunday night's mass shooting stands at an intersection of the north end of the Las Vegas Strip, October 3, 2017 in Las Vegas, Nevada. The gunman, identified as Stephen Paddock, 64, of Mesquite, Nevada, allegedly opened fire from a room on the 32nd floor of the Mandalay Bay Resort and Casino on the music festival, leaving at least 58 people dead and over 500 injured. According to reports, Paddock killed himself at the scene. The massacre is one of the deadliest mass shooting events in U.S. history. (Photo by Drew Angerer/Getty Images)

Stories of heroism are emerging amid the tragedy of the deadliest mass shooting in U.S. history: people coming forward during the chaos to put their own lives in danger to help others. NBC national correspondent Miguel Almaguer reports for TODAY from Las Vegas.