NEW YORK (NEXSTAR) — A man stalked through a Manhattan office tower firing a rifle Monday, killing four people, including a New York City police officer, and wounding a fifth before taking his own life, officials said.

The shooting took place at a skyscraper that is home to the headquarters of both the NFL and Blackstone, one of the world's largest investment firms, as well as other tenants.

The gunman, identified by authorities as Shane Tamura of Las Vegas, had a ‘documented mental health history,’ according to Police Commissioner Jessica Tisch, but his motive was still unknown.

A note found on Tamura read that he had suffered a brain injury, according to Mayor Eric Adams.

“He was not an NFL player,” Adams said. “It appears as though he was blaming the NFL for his CTE… and he shot him

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