Who is Shane Tamura? What we know about alleged NYC gunman at NFL building

USA Today

4 days ago

News continues to pour in about the horrific Midtown Manhattan shooting on Monday night that killed at least four people and injured others, including an unnamed NFL employee who is in the hospital as of the last update.
Police identified the alleged gunman as Shane Tamura, who also killed himself in the shooting after opening fire with a rifle.
Here's everything we know so far about Tamura as this story continues to develop, including a report on what he may have been trying to do in 345 Park Avenue, which is the home of the NFL's headquarters, among other businesses in the New York City office building:
Who is Shane Devon Tamura?
Per USA TODAY:
The alleged gunman was identified as 27-year-old Shane Tamura, of Nevada. Police said the motive for the shooting remains under investigation and investigators are working to understand why the suspect targeted the commercial building.
'We believe this to be a lone shooter and there is no longer an active threat to the public,' [New York City Police Commissioner Jessica] Tisch said, who said Tamura had a "documented mental health history."
What was in the Shane Tamura note found by police with a connection to the NFL?
As of right now, we don't know if there was any actual connection. But according to multiple sources including ABC News:
[Tamura] carried a note in his pocket claiming he suffered from CTE and asking that his brain be studied, police sources told ABC News.
The note also made references to the National Football League, police said. The shooting on Monday took place at 345 Park Ave., which houses, among other companies, the NFL's headquarters.
Those references, per CNN, contained "grievances with the NFL."
Did Shane Tamura play football?
Apparently he did in high school.
What is Chronic Traumatic Encephalopathy?
That's what CTE is known as. Per USA TODAY in 2022:
CTE stands for chronic traumatic encephalopathy, a progressive degenerative brain disease, according to Boston University's CTE Research Center, which has led much of the research on the disease. The condition is caused by a history of repeated hits to the head and emerges months or even years after the head injuries were sustained, according to Boston University.