A man rushed to a Brooklyn hospital in diabetic shock died when he was ignored for seven hours in the emergency room, his furious family claims in a lawsuit.

Todd Johnson, 42, twice tried to leave Interfaith Hospital to get help elsewhere, only to collapse outside and be carried back to the ER by security guards, his relatives say.

Despite passing in and out of consciousness during his hellish hours slumped on a gurney, Health Department records show Johnson — an event planner and restaurateur who co-owned Bedford-Stuyvesant's now-defunct Le Starving Artiste Cafe — was given no treatment at all and wasn't even registered as a patient.

"He just needed to be rehydrated and given insulin," said attorney Elena Carter.

"If he had gotten that, this man would be alive today. What happened to him was appalling."

Johnson, who didn't know he had diabetes, had been sick and suffering from delirium for a few days before he called 911 in March 2006.

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