The police said that a three-page note was found in the wallet of the gunman who opened fire in a Midtown Manhattan office tower on Monday, killing four people.
The note carried by the gunman, Shane Tamura, a former high school football player, referred to chronic traumatic encephalopathy, or C.T.E., a brain disease that has afflicted people who play contact sports. The disease can be definitively diagnosed only after death.
The note, from which the police released excerpts, also inveighed against the National Football League, which has offices at 345 Park Avenue, where the shooting took place, saying it had concealed the danger of the sport in favor of profits.
The note made reference to a former N.F.L. player, Terry Long, and drinking “a gallon of antifreeze” — the method by which Mr. Long killed himself in 2005.
Mr. Tamura shot himself in the chest, rather than the head.
“Study my brain please,” the note said. “I’m sorry.”
Maria Cramer is a Times reporter covering the New York Police Department and crime in the city and surrounding areas.
Chelsia Rose Marcius is a criminal justice reporter for The Times, covering the New York Police Department.
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