Ken Ritter

In the days and months before he mowed down concertgoers from his high-rise hotel suite, gunman Stephen Paddock booked rooms overlooking two other music festivals in Las Vegas and Chicago, authorities said. His movements raised the possibility he was contemplating attacks at those sites. The details emerged as investigators struggled for a fourth day to explain what led the 64-year-old high-stakes gambler to open fire Sunday night on an open-air country music festival from the 32nd floor of the Mandalay Bay hotel casino. He killed 58 people and injured nearly 500 before taking his own life.