Shane Tamura, who carried out a fatal shooting attack at a Manhattan office tower housing the National Football League, showed evidence of early-stage degenerative brain disease tied to repeated blows to the head, according to New York City’s chief medical examiner.

The shooter had left a note at the crime scene accusing the NFL of abandoning players with head injuries and asked that his brain be examined for chronic traumatic encephalopathy. A postmortem examination found evidence of low-stage CTE in Tamura’s brain.

“The science around this condition continues to evolve, and the physical and mental manifestations of CTE remain under study,” the office said.

On July 28, Tamura carried out one of the deadliest mass shootings in New York in recent years. The attack began in the lobby of 3

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