Shane Tamura, the man who killed four people and then himself in a July shooting at the NFL headquarters building, was posthumously diagnosed with chronic traumatic encephalopathy, according to a statement from the New York City Officer of the Chief Medical Examiner.

Tamura, 27, had claimed in a note found in his wallet following the shooting that he believed he had CTE and wanted his brain tested for it after his death. The medical examiner's office finding determined "unambiguous evidence" of CTE in Tamura's brain tissue. The testing determined Tamura suffered from "low-stage CTE." CTE can only officially be diagnosed after death.

Tamura entered 345 Park Avenue around 6:30 p.m. on July 28 and killed four people: Didarul Islam, an off-duty police officer; Wesley LePatner, a real estate

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