"He was doing well, but he had had two previous heart attacks. He became short of breath, and died in the ambulance," said Carmen Palacios, who had been helping him during his rehabilitation process over the past year.
Moreno Sepulveda had slimmed down to 320 kilogrammes before undergoing gastric bypass surgery to reduce his stomach.
His doctor said following the procedure that they hoped to get him down to about 85 kilogrammes eventually.
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