'Let me first say that I have been a member of MENSA for 35 years,' he wrote, then gave credentials including 'a masters degree and a doctoral degree from top-tier universities.' In a 2014 self-published essay, Polito - despite no expertise in the field - claimed he was the first to solve the Zodiac killer's cryptography. The website included a 109-page document of praise purportedly given by past students at a business school in North Carolina. Read more: UNLV shooter had a list of targets, along with a 9-millimeter gun and extra ammo The writings revealed an obsessive nature: hundreds of organized links to favorite articles, games, things to do in Las Vegas and more. On his personal website, Polito wrote at length about his favorite topics, rarely failing to mention membership in the Mensa society for people with high IQs. He urged caution to academic officials nationwide who receive any mail without a return address. Police recovered the letters and the first one opened 'had an unknown white powder substance in it,' McMahill said. The shooter had a list of people he was looking for at UNLV, as well as at the college in North Carolina where he previously worked.Ī dashboard camera in his vehicle revealed to investigators that before Wednesday's shooting, Polito went to a post office and mailed 22 letters to academic officials with no return address.

Polito had been charged with criminal trespass in Virginia in 1992, the sheriff said.

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