Police say a gunman who killed four people in a Manhattan skyscraper before taking his own life claimed to have a brain disease linked to contact sports and was trying to target the National Football League's headquarters in the building. New York City Mayor Eric Adams says investigators believe the gunman wanted to get up to the NFL's offices on Monday but entered the wrong elevator. Police say Shane Tamura, a Las Vegas casino worker, had a note in his wallet that suggested he had a grievance against the NFL and asked that his brain be studied. He played high school football in California but never played in the NFL. Among those killed was an off-duty police officer working security.

Most Americans believe health insurance profits and coverage denials share responsibility for the killing of UnitedHealthcare's CEO — although not as much as the person who pulled the trigger. So says a new poll from NORC at the University of Chicago. It finds that about 8 in 10 Americans say that the person who committed the killing has "a great deal" or "a moderate amount" of responsibility for the Dec. 4 shooting of Brian Thompson. Still, some see suspect Luigi Mangione as a heroic figure. About 7 in 10 adults say coverage denials or health insurance profits also bear at least "a moderate amount" of responsibility for Thompson's death.