The gunman in the Manhattan office shooting said in a note that he believed he had C.T.E., a degenerative disease linked by studies to repeated hits to the head.

The gunman in the Manhattan office shooting said in a note that he believed he had C.T.E., a degenerative disease linked by studies to repeated hits to the head.

New York City Mayor Eric Adams said that the gunman in a mass shooting in Manhattan had a note on his body mentioning CTE.

Shane Tamura said he had CTE. His claim, which is unproven, has again put a spotlight on the NFL's troubling history with its players and the disease.

Shane Tamura never played in the league, but the police believe he was seeking vengeance over the handling of head injuries in football.

From symptoms to the illness' risk factors — here’s what you need to know about the disease, which can only be detected by autopsy.

Information that the killer carried in a note referring to the degenerative brain disease CTE offered a possible motive for the Monday shootings at offices used by the National…

We explain what we know about the disease after the shooting in Manhattan.