The g::unman who killed an NYPD officer and three other people in a Midtown office building on Monday evening was carrying a note that offered clues to his possible motive, sources told The Post.

Shane Tamura, 27, cited the NFL in the writings, which were found after he turned his g::un on himself on the 33rd floor of 345 Park Ave. — a swanky skyscraper that houses the football league’s headquarters.

Suspected shooter Shane Tamura is seen dead on the floor in surveillance video after Monday's mass shooting.
Suspected sh00ter Shane Tamura is seen dead on the floor in surveillance video after Monday’s mass sh00ting.Obtained by NY Post

Shooter Shane Tamura had a concealed-carry handgun permit that expires in 2027, according to photos obtained by The Post.
Shooter Shane Tamura had a concealed-carry handg::un permit that expires in 2027, according to photos obtained by The Post.Obtained by the NY Post

In the note, which was several pages long, Tamura blamed football for his apparent struggle with the neurodegenerative disease chronic traumatic encephalopathy (CTE), law enforcement sources said.

Tamura, who fatally sh0t himself in the chest, also asked in the note that his brain be studied, according to the sources.

NYC Midtown sh00ting timeline

NYPD Commissioner Jessica Tisch provided a timeline of events leading up to Monday’s mass sh00ting:

Reports of the sh00ting at 345 Park Ave. start coming in around 6:28 p.m.
The sh00ter, Shane Tamura, 27, is seen on surveillance footage getting out of a double-parked black BMW between 51st and 52nd streets, with an M4 rifle.
He walks towards the skyscraper, enters the lobby and turns right, where he sh00ts police officer Didarul Islam, 36, dead.
Tamura g::uns down a woman cowering behind a pillar in the lobby as he sprays more bullets and walks toward the elevator bank — where he sh00ts dead a security guard crouching at his desk.
One more man reports being sh0t and injured in the lobby. He was in critical but stable condition.
The g::unman allows a woman to walk out of the elevators unharmed, before heading up to the 33rd floor, where building owner Rudin Properties’ offices are located, “and begins to walk the floor, firing as he traveled.”
One man is sh0t and killed on that floor.
“He then proceeds down a hallway and sh00ts himself in the chest,” ending his rampage.
It’s unclear how long the mayhem lasted. Tisch posted on X at 7:52 p.m.: “The scene has been contained and the lone sh00ter has been neutralized.”

Workers are seen barricading themselves in their office during Monday's mass shooting.
Workers are seen barricading themselves in their office during Monday’s mass sh00ting.

Front cover of the New York Post on July 29, 2025.
Front cover of the New York Post on July 29, 2025.

The NFL has offices on floors five through eight of the Park Avenue high-rise, though Tamura wound up taking the elevator up to the 33rd floor, where he turned the g::un on himself after the massacre.

Tamura, who reportedly had a “documented mental health history,” had sh0t a fifth victim in the lobby of the building who survived the attack, police said.

The surviving victim appears to an NFL employee, as the league’s commissioner, Roger Goodell, told staffers in a letter that one of their own had been “seriously injured” in the sh00ting.

Tamura was a security guard at a Las Vegas casino, but back in his high school days in California he was a described as a standout football player.

“It looked like the sky was the limit, and then it wasn’t anymore,” former classmate Caleb Clarke told NBC News.

Tamura graduated from Golden Valley High in 2016. Ahead of his senior year, his coach told the Los Angeles Times that he expected “big things” from the running back and other star players on the team.