(NewsNation) — Legendary broadcaster Bob Costas believes the rhetoric that New York City shooter Shane Tamura had a "legitimate grudge" against the NFL is absurd.

According to New York City Mayor Eric Adams, Tamura was attempting to enter the NFL's floor inside 345 Park Avenue, where he killed four people, but took the wrong elevator.

Tamura reportedly had a three-page suicide note inside his pocket, which claimed he had a brain injury from a contact sport and blamed the National Football League. Tamura, who played high school football, reportedly wanted his brain studied after his death.

"CTE and football are inseparable, but the idea that this guy had a legitimate grudge against the NFL is ridiculous," Costas told NewsNation.

"The NFL in the last decade has responded as best they pos

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