The NFL season kicked off at the annual Hall of Fame game with a moment of silence for the four people killed earlier this week by a shooter who was targeting league headquarters in New York.

Roger Goodell was emotional on Thursday as he publicly addressed the deadly shooting that took place inside 345 Park Avenue, the building that houses the NFL’s New York offices, earlier this week. The NFL commissioner did not attend Thursday’s Hall of Fame game in Canton,

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.