The one-time football player who massacred four people in a Manhattan skyscraper was suffering from the degenerative brain disease known as CTE, an autopsy has revealed.

Shane Tamura, who fatally shot himself in the chest after the July attack, carried a note that said he was targeting NFL executives because he felt they had concealed the risk of brain trauma in the sport to protect their profits.

“Please study brain for CTE,” his note read, according to police. “I’m sorry. The league knowingly concealed the dangers to our brains to maximize profits. They failed us.”

Police said the 27-year-old arrived at the NFL’s building armed with a rifle but took the wrong elevator when attempting to reach its offices. Instead, he exited on another floor and opened fire on employees of Blackstone

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