NEW YORK (AP) — A man who killed four people at a Manhattan office building bought the rifle he used in the attack and the car he drove across country from his supervisor at a Las Vegas casino, authorities said Wednesday.

Shane Tamura, 27, fatally shot three people Monday 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. The building housed the National Football League’s headquarters and other corporate offices.

In a note found on his body, Tamura assailed the NFL’s handling of concerns about chronic traumatic encephalopathy , and the former high school football player claimed he himself had the degenerative brain disease, according to police. Known as CTE, it has been linked to concussions and

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