NYPD: Suspect in NYC shooting has 'documented mental health history'

Crime Incident - A gunman killed a NYPD officer and three others in a Manhattan high-rise building [1] - The gunman left behind a note referencing the NFL and CTE [1] Media Coverage - MSNBC Investigative Correspondent Marc Santia reported from outside the building [1] - Former NYPD Detective Tom Verni and independent political strategist Reed Galen discussed the latest updates on MSNBC [1] - MSNBC provides breaking news, in-depth analysis of political headlines, commentary and informed perspectives [1]