A 2017 study found that more than 87% of football players tested across all levels — high school, college, and pros — tested positive for Chronic Traumatic Encephalopathy.

After killing four and taking his own life, Shane Tamura — a former football player at two L.A.-area high schools — left behind a suicide note, authorities say, alleging he had the brain disease CTE.

The NYC mass shooter blamed football for his actions. But Dr. Bennet Omalu, the man who discovered CTE, says that excuse doesn’t hold up.