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 Football League, among others.

Police say Shane Tamura killed NYPD officer Didarul Islam and critically injured an NFL employee after ‘spraying’ the lobby of a Park Avenue skyscraper with bullets from an…

The suspect's message at the scene may have provided a motive for his attack that killed four at a Park Avenue office building.