The man who police say shot and killed four people and seriously injured another in a Midtown Manhattan office building Monday evening apparently held a grudge against the National Football League.

New York Mayor Eric Adams said in interviews Tuesday morning that the suspected gunman, 27-year-old Shane Devon Tamura of Las Vegas, left a note in which he said he suffered from chronic traumatic encephalopathy after playing high school football.

"He seemed to have blamed the NFL," Adams said. "The NFL headquarters was located in the building, and he mistakenly went up the wrong elevator bank."

The note was found on his body after he reportedly died by suicide. It has not been confirmed as to whether he suffered from CTE, the degenerative brain disease that has been linked to contact sports,

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