Here's a bit of detail: Daniel Enchautegui was an NYPD officer who was awakened by sounds of a break-in next door. He called 911, was told backup was coming. It wasn't. The 911 operator apparently did nothing.
He went to the scene, was fatally shot by the burglars, but managed to wound them both. His family is now suing the city, and the city is stonewalling attempts to get at the 911 tapes.