He halluciated having been in the NFL, and then went to the NFL's corporate offices to get vengeance for his hallucination.
The crazed gunman who killed an NYPD officer and three other people in a Midtown skyscraper on Monday evening was carrying a note in his pocket that expressed grievances with the NFL and claimed he suffered from CTE -- a brain injury linked to head trauma, sources told The Post.
Shane Tamura, 27, cited the NFL in the writings, which were found after he fatally shot himself in the chest on the 33rd floor of 345 Park Ave. -- a swanky skyscraper that houses the football league's corporate headquarters.
The mentally ill man wanted to shoot up the NFL's offices on levels 5 through 8 -- but "mistakenly went up the wrong elevator banks" and ended up on a higher floor, Mayor Eric Adams confirmed Tuesday.
In his three-page ramblings, Tamura blamed football for his apparent struggle with the neurodegenerative disease chronic traumatic encephalopathy (CTE) and pleaded for his brain to be studied in the wake of the massacre, law enforcement sources said.
He also specifically referred to Terry Long, the former Pittsburgh Steelers player who was diagnosed with CTE after downing antifreeze to kill himself 20 years ago.
"Terry Long, football gave me CTE and it caused me to drink a gallon of antifreeze," the note stated, according to sources.
"You can't go against the NFL, they'll squash you."
"Please study brain for CTE. I'm sorry. The league knowingly concealed the dangers to our brains to maximize profits," Tamura continued. "They failed us."
The NFL has offices elsewhere in the Park Avenue high-rise, and one of its employees was among those shot, though not fatally.
Adams confirmed Tamura's note "alluded to having CTE from playing NFL" -- even though "he never played in the NFL."
"It appears as though he was going after the employees of the NFL," the mayor confirmed on Fox 5.
"We're still going through the suicide note to zero in on the exact reason, but at this time it appears as if it's something attached to his belief he experienced CTE from the NFL."
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Tamura, who lived in Las Vegas and had a known mental health history there, initially opened fire in the building's lobby before taking the elevator to the 33rd floor, where he turned the gun on himself.
He shot a fifth person, who survived the attack.
This maniac never played in the NFL, or even college. He played only high school football.
The below photo of the maniac killer was publicized early into the incident.
CNN straight-up lied and claimed the killer was "possibly white," because that's the only race the Gaslight Media allows people to mention in crime stories.
In what sense is he "possibly white," apart from in your own hallucinations and wishcasting? Does Erin Burnett suspect a Soul Man-style scenario? Did she think the killer was C. Thomas Howell?
CNN's Erin Burnett is being skewered for reporting that the gunman who opened fire in a Midtown skyscraper -- killing an NYPD cop and three others -- was "possibly white" after viewing the initial security footage released immediately after Shane Tamura's deadly rampage.
In the photos first shared online, Tamura, 27, was captured in broad daylight walking into 345 Park Ave. with a Palmetto State Armory AR-15 rifle in his hand.
Burnett said police knew the gunman had "sunglasses, mustache, male, possibly white" during a broadcast shortly after the shooting Monday evening.
The chilling image of Tamura with the AR-15, however, showed him with a possibly darker or ethnically mixed complexion.
Early police reports also suggested the suspect might be of Middle Eastern descent.
Online critics slammed Burnett's statement for being too premature and presumptive.
"He may be a bunch of different things, basically anything BUT white," one internet commenter said.
"CNN should be shut down. They have not reported a truthful story in what seems like forever," another commenter on X said.
Black commentators are questioning CNN's determination to gaslight the country.
Greg Forman also points out that CNN's Tater is boohoo whinin' and cryin' that Trump is talking about yanking the broadcast licenses of the Gaslight Media.