The gunman who killed four people, including an NYPD officer, reportedly had a grievance against the NFL and blamed football for issues with CTE.

The 27-year-old man who shot and killed four people at a Midtown office building on Monday carried a note in his pocket, police sources told ABC News.

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A fatal shooting unfolded at 345 Park Avenue, a major office tower in Midtown Manhattan, on Monday. The suspected gunman was reportedly found dead on the 33rd floor from an apparent self-inflicted wound.

In a note left in his wallet, the shooter referenced chronic traumatic encephalopathy, commonly called by its initials CTE, and criticized the NFL for covering up the traumatic brain effects of playing football.