NEW YORK — The former high school football player who shot and killed four people in the NFL's Manhattan headquarters had "unambiguous diagnostic evidence" of Chronic Traumatic Encephalopathy, commonly known as CTE, according to a New York City medical examiner.

Shane Tamura, 27, accused the NFL of hiding evidence of CTE in a note found in his wallet. He wrote he had CTE — diagnosable only after death — and implored those who found him: “Study my brain.”

Among the dead were a police officer, a security guard and two people who worked at companies in the building. An NFL employee was badly wounded but survived.

“There is no justification for the horrific and senseless acts that took place,” an NFL spokesperson said in response to the findings. "As the medical examiner notes ‘the scie

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