NFL commissioner Roger Goodell sent a memo to staff following the shooting.

NFL commissioner Roger Goodell sent a memo to staff following the shooting. AAron Ontiveroz

NFL commissioner Roger Goodell sent a memo to staff following the shooting. AAron Ontiveroz

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National Football League Commissioner Roger Goodell sent a note to staff encouraging them to work remotely or take the day off following Monday’s fatal shooting at its New York City office building.

An NFL employee was seriously injured in the attack. Goodell said in the note sent Monday that the employee was in stable condition.

New York City Mayor Eric Adams said Tuesday on news channel PIX11 that a note was found on the shooter saying he had CTE, a degenerative brain disease linked to repeated head trauma, and that the gunman appeared to be targeting the NFL over CTE.

CTE, or chronic traumatic encephalopathy, is a contentious issue in contact sports like American football.

The gunman killed four people, including an NYPD officer and an executive at asset management firm Blackstone, after entering the office building at 345 Park Avenue. KPMG also occupies the building.

Police identified the gunman, who died of a self-inflicted gunshot wound, as 27-year-old Shane Tamura.

Here’s the memo Commissioner Goodell sent to employees: