The gunman, who said in a note he believed he had CTE, targeted skyscraper that houses the NFL's headquarters.

A Nevada man recently traveled to New York City, entered a Manhattan building wearing body armor, carrying an M4 rifle, and fatally shot four people Monday evening, including a New York Police Department officer and injured another,

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,