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The man who shot dead 59 people and injured 527 others in Las Vegas on Sunday night was a multimillionaire who took a huge arsenal of 23 guns into his Mandalay Bay hotel room, which he transformed into an elaborate sniper's nest before opening fire on a country music festival on Monday. 

Stephen Paddock, 64, had made millions from real estate deals, according to his brother; he also owned two planes and several properties across the US, and seemed normal apart from his passion for gambling large sums. 

But he'd also secretly amassed a massive arsenal of 42 firearms. At least one of those was automatic, while another two had been modified with a legal bump-stock devices that allows semi-automatic guns to give full-auto fire of up to 800 rounds a minute. Several had scopes.