The gunman who killed four people in an NY C office building in July had chronic traumatic encephalopathy (CTE), according to the New York City medical examiner’s office.

The degenerative brain disease linked to repeated head injuries sustained in football and other contact sports can only be diagnosed posthumously. The gunman, identified as Shane Tamura, died by suicide following the shooting , which took place in the building that houses the headquarters of the National Football League. The suspect had no known connection to the NFL .

The medical examiner “found unambiguous diagnostic evidence of Chronic Traumatic Encephalopathy, also known as C.T.E., in the brain tissue of the decedent. The findings correspond with the classification of low-stage C.T.E., according to curren

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