Brain injuries and legal battles: the NFL’s persistent problem with CTE

The league first publicly accepted there was a link between the sport and the incurable brain disease in 2016 - but still outright denied claims

On Monday evening, a man brandishing an AR-15-style rifle walked into the east midtown Manhattan office tower where the NFL is headquartered and killed four people before turning the gun on himself.

Authorities say the man, 27-year-old Shane Devon Tamura of Las Vegas, traveled to New York days before the incident, and surveillance footage from the Park Avenue address showed him arriving in a suit and tie that concealed body armor.