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

Shane Tamura, the Park Ave. gunman who killed an NYPD officer and three others before taking his own life, left behind a suicide note saying he suffered from CTE, a brain injury often linked to playing football, police sources said Tuesday.

Shane Tamura, who shot and killed four people in a Manhattan office building, once worked surveillance for a Las Vegas casino. In a suicide note, the 27-year-old referenced CTE and claimed the NFL "failed" him.

A police officer and three other people were shot and killed, and one other injured, by a crazed gunman who stormed a swanky Midtown skyscraper early Monday evening — before turning the gun on himself,

Shane Tamura from Las Vegas caused a deadly shooting in Manhattan. The incident occurred at 345 Park Avenue. Tamura killed four people, including offi

The gunman who opened fire inside 345 Park Ave in Manhattan on Monday has been identified as Shane Tamura, according to the New York Post. He is from Las Vegas. Photos from outside of the building circulated around social media depicting the suspect appearing to casually walk up to the building at 345 Park Ave with a rifle in-hand.

Shooter Shane D Tamura killed an NYPD officer, injured a civilian, and died by suicide on the 33rd floor of 345 Park Ave, home to major NYC offices.

Shane Tamura, a 27-year-old Las Vegas resident, opened fire at 345 Park Avenue in Midtown Manhattan, resulting in four fatalities, including an NYPD o