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, New York's medical examiner said on Friday.

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

Tamura, a Las Vegas casino worker, carried out the mass shooting on July 28, spraying bullets into the lobby of a Manhattan office building housing the headquarters of the NFL, which he accused of hiding evidence of the brain injury.

Among the dead were a police officer, a security guard and two people who worked at

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