Stunning video from a surveillance camera at a Brooklyn hospital shows a woman dying on the floor of a psychiatric emergency room while staffers ignore her.

The video was released by lawyers suing Kings County Hospital alleging neglect and abuse of mental health patients at the medical facility.

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The video shows the 49-year-old woman falling out of her chair at about 5:30 a.m. June 19, then lying face-down on the floor and thrashing around before going still. The woman died.

People nearby, including two security guards, do nothing to help. An hour passes before a fellow patient finally gets the attention of a staffer.

The agency that runs the municipal hospital — the city's Health and Hospitals Corp. — fired six staffers, including the two security guards.