NYC gunman Shane Tamura is seen on video talking about his high school football career in California after a game in September 2015.

Shane Tamura, a 27-year-old former high school football player from Las Vegas with a documented mental health history, was identified as the gunman who killed four people, including an NYPD officer, in a mass shooting at 345 Park Avenue in Manhattan on July 28,

A Nevada man who recently drove across the country to New York and has a mental health history is accused of walking into a Manhattan building with a rifle and opening fire Monday evening, killing four people,