An NFL employee was among those injured in a shooting in New York City that left four dead. Philip Marcelo and Eric Tucker of the Associated Press report authorities identified the gunman as Shane Tamura of Las Vegas.

An NFL employee was seriously injured during the mass shooting at the Manhattan office tower that houses the league’s headquarters.

A note found in the gunman's wallet was critical of the NFL and mentioned CTE. The 27-year-old wrote, “Study my brain please. I’m sorry."

Officials say a man carrying a rifle killed four people at a New York City office tower. The shooting took place Monday afternoon at a midtown Manhattan office building that houses finance companies and the NFL headquarters.

Follow along for live updates on the New York City shooting, where police investigate motive after five people, including the gunman, were killed in the Monday shooting.

Police lined the streets of New York City to pay their respects to fellow officer Didarul Islam, who was among the four victims of a gunman’s rampage Monday at a Manhattan office tower.