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Clark County Sheriff Joe Lombardo speaks at a news conference regarding the Oct. 1 shooting on Friday, Aug. 3, 2018, in Las Vegas. More than 10 months after the deadliest mass shooting in modern U.S. history, police say they are closing their investigation without answering the key question: What drove a gunman to unleash a hail of gunfire that killed 58 people and wounded hundreds more? (AP Photo/John Locher)

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In the year before Las Vegas gunman Stephen Paddock carried out the worst mass shooting in modern U.S. history, the high-stakes gambler appeared to have become increasingly unstable, distant and constantly complained of being sick, according to a final investigative report released Friday.

By KEN RITTER & MICHELLE L. PRICE, AP August 3, 2018