Watch: "Don’t hold your heads down..," NYC shooter Shane Tamura’s 2015 video resurfaces after mass shooting

A mass shooting at a Midtown Manhattan skyscraper, housing the NFL headquarters and financial firms, resulted in four fatalities, including an off-duty NYPD officer. The shooter, Shane Tamura, a 27-year-old from Hawaii, was found dead inside the building after apparently taking his own life.