LAS VEGAS (KTNV) — We're learning more about the suspected gunman who opened fire at a Manhattan office building and his time in Las Vegas.

Shane Tamura is suspected of killing four people before shooting himself on the 33rd floor of the building at 345 Park Avenue, authorities said.

New York City Mayor Eric Adams said Tuesday that the gunman was attempting to target offices for the National Football League but entered the wrong elevator.

WATCH: Channel 13's Anyssa Bohanan reports live in the neighborhood where Tamura lived as the investigation continues Tuesday morning. What we know about the Las Vegas man who shot and killed four people in Midtown Manhattan

According to the Associated Press , a rambling note found on his body suggested he had a grievance against the NFL over an u

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