The mother of the man who killed four people at a Manhattan office tower home to the NFL told 911 dispatchers during a 2022 incident when he threatened to kill himself that he suffered from a sports-related concussion and other issues, new information released by Las Vegas police Tuesday revealed.

Shane Tamura, 27, had a documented history of mental health problems and carried a handwritten note in his wallet when he carried out the shooting that claimed he had chronic traumatic encephalopathy , known at CTE, investigators said. He fatally shot three people in the building lobby before taking an elevator to the 33rd floor, killing a fourth victim and then ending his own life, according to police.

He accused the football league of hiding the dangers of brain injuries linked to cont

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