October 10, 2017
A woman visits a makeshift memorial for victims of a mass shooting Monday, Oct. 9, 2017, in Las Vegas. Stephen Paddock opened fire on an outdoor country music concert killing dozens and injuring hundreds.(AP Photo/John Locher)
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More than a week after the deadliest mass shooting in modern U.S. history investigators are stumped about the key question: What led a 64-year-old high-stakes gambler to kill 58 people and wound hundreds of others at a country music concert?
By By KEN RITTER and MICHAEL BALSAMO, Associated Press
October 10, 2017
