Watching it happen, Mr. Augusto, whom neighborhood friends call Gus, rose from a chair 20 to 30 feet away and took out a loaded Winchester 12-gauge pump-action shotgun with a pistol-grip handle. The police said he bought it after a robbery 30 years ago.
Mr. Augusto, who has never been in trouble with the law, fired three blasts in rapid succession, the police said, although Vernon McKenzie, working at an Internet company next door, heard only two booms, loud enough to send him rushing to a window, where he heard someone shout: “You’re dead! You’re dead!”
The first shot took down the gunman at the front. He died almost immediately, according to the police, who said he was 29 and had been arrested for gun possession in Queens last year and was the nephew of a police officer.
Mr. Augusto’s other two blasts hit all three accomplices, who stumbled out the door, bleeding.