More is being learned about the man behind Sunday's Las Vegas massacre, who was identified as 64-year-old Stephen Paddock of Mesquite, Nevada. Paddock's stunned brother, Eric, could only shake his head as he spoke to reporters outside his home near Orlando. "We are shocked, horrified, completely dumbfounded," his brother said of his feelings about the situation. "He's a guy who lived in a house in Mesquite, drove down and gambled in Las Vegas. He did stuff, ate burritos."