NYC office shooter had low-level CTE, medical examiner finds

Shane Tamura killed four while targeting NFL offices in July

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Shane Tamura, 27, drove from Las Vegas to New York City with an assault-style rifle in July, shooting four in a Park Avenue skyscraper before killing himself.

Police believe he was targeting the offices of the National Football League (NFL), which were inside the building.

In notes left at the scene, Tamura reportedly blamed the NFL for concealing the effects of CTE and asked for his brain be studied. CTE can only be diagnosed post-mortem.

New York City's chief medical examiner said the shooter's autopsy confirmed that he had "low-stage CTE" and the diagnosis was "unambiguous".