NEW YORK — The former high school football player who killed four people inside a Manhattan office tower that houses the headquarters of the NFL, and who blamed the league for hiding the dangers of brain injuries, was suffering from the degenerative brain disease CTE, a city medical examiner said Friday.

Shane Tamura, 27, had “unambiguous diagnostic evidence” of low-stage chronic traumatic encephalopathy, commonly known as CTE, according to a report from the New York City medical examiner.

Tamura, a Las Vegas casino worker, shot himself in the chest after spraying bullets into the Manhattan office building on July 28, killing four people , including a police officer, a security guard and two others who worked inside the building.

He had intended to target the NFL office, officials said,

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