article_snippet: Cell phone footage taken by a witness and shared with CBS New York shows an older man approaching a younger man at the Borough Hall station in Brooklyn and getting into a scuffle before a shot is heard .
article_snippet: The men and the ex-corrections officer argued before The men and the officer pushed an injured man down into an empty seat on a Brooklyn-bound subway train in Manhattan, police said.
article_snippet: The men and the officer exited a Brooklyn-bound subway train in Manhattan at the next stop in Brooklyn, where there was a second confrontation on the station's mezzanine level, police said.
article_snippet: Television station WCBS broadcast a cellphone video showing a man it identified as the retired officer cornering a smaller man near an exit in the station and pushing a smaller man near an exit in the subway station.
article_snippet: The men and the officer are seen struggling before a gunshot is heard and bystanders scatter.
article_snippet: : Witnesses said the fight began when the shooting suspect stepped between two men .
article_snippet: The two exchange words and the shooting suspect apparently pushes the shooting suspect, A cell phone video obtained by CBS New York  shows.
article_snippet: The 69-year-old gunman was reportedly heard telling The 69-year-old gunman opponents, 'don't touch me' before the brawl .
article_snippet: Tempers flare: The 69-year-old former jail guard got on the train and was trying to walk past the duo when some words were exchanged .
highlights_snippet: The ex-officer got into an argument with two young men aboard a southbound train on Tuesday afternoon after The ex-officer stepped between two young men aboard a southbound train .
  
highlights_snippet: two young men aboard a southbound train got off at Borough Hall and The ex-officer and an argument with two young men aboard a southbound train turned physical between the officer and one of the men .
  
highlights_snippet: Witness video showed two young men aboard a southbound train briefly scuffling before a shot went off .
  