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."

The man who stalked through a New York City skyscraper firing a rifle tried to target the National Football League headquarters but took the wrong elevator, Mayor Eric Adams said. The gunman killed four people including a New York City police officer and wounded a fifth before taking his own life Monday evening,

Multiple people have been shot and killed at a New York City office building where the NFL is headquartered, according to NYC Mayor Eric Adams.