Jerome Murdough was just looking for a warm place to sleep on a chilly night last month when he curled up in an enclosed stairwell on the roof of a Harlem public housing project where he was arrested for trespassing.

A week later, the mentally ill homeless man was found dead in a Rikers Island jail cell that four city officials say had overheated to at least 100 degrees, apparently because of malfunctioning equipment.

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