In a video message, Tisch said Tamura left a suicide note and claimed to be suffering from chronic traumatic encephalopathy (CTE), possibly from playing high school football. Tamura also blamed the NFL and asked that his brain be studied for signs of the degenerative disease.

A gunman from Las Vegas shot five people, killing four, including an off-duty New York City police officer, inside a Manhattan skyscraper, before fatally shooting himself, officials confirmed

Tamura was involuntarily held after being considered a danger to himself or others, according to a law-enforcement official.

A suicide note blamed the NFL and possible CTE for his mental decline, though Tamura never played professionally, only in high school.

The residence of Shane Tamura, identified as the gunman in the fatal shooting at a Manhattan office building in New York City and who was killed by a self-inflicted gunshot wound is seen on Monday, July 28, 2025 in Las Vegas, Nev. (AP Photo/Ty O’Neil)

Investigators found a note left by Midtown mass shooter Shane Tamura at his Nevada apartment saying he felt like a "disappointment" to his parents -- including his father, a retired cop, sources told The Post.

Authorities also found a vehicle with Nevada plates registered to Tamura at the scene, with a rifle case inside, sources said.

The alleged gunman at a shooting rampage in a midtown Manhattan office building was identified as 27-year-old Shane Tamura, of Nevada.