The portrait, gleaned from interviews with hundreds of people interviewed over the past week, is that while Paddock might have been financially successful, he had real difficulty interacting with people. He is described as standoff-ish, disconnected, a man who had difficulty establishing and maintaining meaningful relationships…

The 64-year-old was known for playing gambling games in casinos for hours at a time with little or no human contact. One source told ABC News that Paddock was exhibiting many antisocial traits that are typical of past mass shooters.