Just 18 years old and already with millions of fans, and his faithful mahomies have filled our plaza for a concert on monday, may 26th, 2014. From nbc news, this is today, with matt lauer and savannah guthrie, live from studio 1a in rockefeller plaza. And good morning. Welcome to today on this memorial day monday morning. Im Natalie Morales. And im willie geist along with tamron hall, dylan dreyer is with us. Matt, savannah, and al all have the morning off. Lets keep track of how many times we can say mahomies. Thats Austin Mahone live practicing right now, rehearsing, getting ready for what would be a massive concert outside on our plaza. Huge crowd outside. Just a couple of young girls. I love the brave dads wearing the tshirts im here with my daughter. Sure you are. And to clarify its mahomies. If youre a fan, you know who you are. We will get to that concert coming up in the next hour. But first, todays top story. What were now learning from the investigation into that killing spre