(CNN) A New Jersey grandmother who depended on an electric-powered oxygen tank to breathe died hours after power was cut off to her home, family members say.

The family of Linda Daniels, 68, acknowledge they were behind payments on the PSE&G power bill. But Daniels' son showed CNN affiliate News 12 New Jersey bank records showing he paid the company $500 two days before power was shut off last Thursday.

Temperatures that day in Newark, where Daniels lived, were as high as 91.

"We were getting ice and putting ice on her, fanning her, trying to make it cool, but we couldn't pump the oxygen," said her daughter, Desiree Washington.

The oxygen tank Linda Daniels used.

News 12 New Jersey reported that Daniels had been in hospice care since mid-April with congestive heart failure.

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