Shane Tamura, who traveled from Nevada to New York and opened fire at the building containing the NFL’s headquarters, had Chronic Traumatic Encephalopathy.

Via NBCNews.com, the New York City Office of the Chief Medical Examiner disclosed the diagnosis on Friday .

Tamura, 27, carried in his pocket a three-page note in which he wrote that he had suffered a traumatic brain injury. He blamed the NFL for “concealing the dangers to players’ brains to maximize profits.”

“Study my brain please,” Tamura wrote. “I’m sorry.”

Tamura, who played high-school football, died of a self-inflicted gunshot wound after killing four others at 345 Park Avenue.

The medical examiner dubbed the evidence “unambiguous,” classifying the disease as “low-stage.” However, the medical examiner did not link CTE to

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