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The 27-year-old Las Vegas man who walked into the NFL headquarters Park Avenue building with a rifle and opened fire, linking football to his mental illness as he killed four people before turning the gun on himself, did indeed have CTE, the New York City medical examiner's office said in a statement Friday.

Shane Tamura, 27, died by suicide, with the cause of death being a self-inflicted gunshot wound to the torso, according to the medical examiner. He had left a suicide note at the July scene, wondering if CTE, or chronic traumatic encephalopathy, tied to his youth football activities, could be responsible for his mental illness.

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Tamura, in the note, asked for his brain to be teste

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