Gunman who targeted NFL HQ 'had brain disease that's linked to playing American football'A gunman who murdered four people in a New York office building before taking his own life had CTE, a degenerative brain disease which has been linked to playing American football.
Source: Gunman who targeted NFL HQ 'had brain disease that's linked to playing American football' (https://news.sky.com/story/gunman-who-targeted-skyscraper-housing-nfl-hq-had-brain-disease-thats-linked-to-playing-american-football-13438862)