The oldest killer was 88; he murdered his wife. The youngest was 9; she stabbed her friend. The women were more than twice as likely as men to murder a current spouse or lover. But once the romance was over, only the men killed their exes. The deadliest day was on July 10, 2004, when eight people died in separate homicides.

Five people eliminated a boss; 10 others murdered co-workers. Males who killed favored firearms, while women and girls chose knives as often as guns. More homicides occurred in Brooklyn than in any other borough. More happened on Saturday. And roughly a third are unsolved...

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