Shooter with assault rifle kills four people including police officer in terrifying rampage

The man who unleashed chaos inside a Midtown Manhattan office tower on Monday afternoon has been identified as Shane Tamura, a 27-year-old licensed private investigator from Las Vegas who once dreamed of a life in football.Authorities say Tamura arrived in Manhattan by car on Monday, parked around the corner and walked into 345 Park Avenue in the heart of Midtown Manhattan with a concealed weapon permit issued by the Las Vegas Sheriff's Department. Tamura headed straight into the building, strolling across a wide city plaza with his rifle in plain sight.