NYC shooter left suicide note saying he had CTE, critical of NFL, wanted his brain studied

The gunman who killed four Monday in a midtown Manhattan skyscraper left a suicide note alleging he had CTE, was critical of the NFL and wanted his brain studied.

Gunman Shane Tamura's three-page note in part reads: “Terry Long football gave me CTE and it caused me to drink a gallon of antifreeze. You can’t go against the NFL, they’ll squash you,” according to CNN.

Mayor Eric Adams on Tuesday confirmed the note.

The 27-year-old was likely referring to former Pittsburgh Steelers football player Terry Long who was diagnosed with CTE and died by suicide after drinking antifreeze in 2005.

CTE, or chronic traumatic encephalopathy, is an Alzheimer’s-like disease that is most commonly associated with football players, as it occurs with repetitive hits to the head, even without a concussion.

The NFL, or National Football League, has been criticized for having not done enough to prevent CTE and taking care of the players who suffer from it. The league has a headquarters in the Park Avenue tower where the shootings occurred.

Tamura reportedly played high school football.

“Study my brain please I’m sorry," the note also reportedly reads. 

Police say Tamura had a history of mental illness but are still investigating Tamura's motives.

Tamura killed four people, including a New York police officer, before killing himself. One other person was shot and is in critical but stable condition.