The man who unleashed chaos inside a Midtown Manhattan office tower on Monday afternoon has been identified as Shane Devon Tamura, a 27-year-old licensed private investigator from Las Vegas who once dreamed of a life in football.
Authorities say Tamura, who had a 'documented mental health history', arrived in Manhattan by car on Monday afternoon following a mammoth cross-country trip.
The NYPD revealed on Monday night how Tamura had traveled through Colorado on July 26, through Nebraska on July 27 and through Columbia, New Jersey as recently as 4pm on Monday before arriving in Manhattan to carry out his deadly rampage.
When he arrived, he parked his black BMW around the corner from 345 Park Avenue in the heart of Midtown Manhattan before striding across a wide city plaza with his long-form M4 rifle in plain sight, by his side.
Tamura had his concealed weapon permit issued by the Las Vegas Sheriff's Department on him as he walked straight into the building's lobby and opened fire.
