Excerpted from the on-line New York Times
About halfway through the flight, a call came over the announcement system asking if any doctors were on board, passengers said.....
....five people — four men and one woman — went up to the front of the plane after the call for a doctor was made. Four of them later returned.
The passengers were not told of the emergency. “We asked the stewardesses and they said ’someone fell ill',....
A Belgian cardiologist, Dr. Julien Struyven, 72, checked the pilot’s vital signs and declared him dead. Dr. Struyven told reporters that he tried to use a defibrillator on the plane, but was not able to revive the pilot. Dr. Struyven said a heart attack was the likely cause of death.
....
A medical doctor on board the flight pronounced the pilot dead, according to Les Dorr Jr., a spokesman for the Federal Aviation Administration. The pilot was removed from the cockpit to the crew rest area, he said.
Ms. King said that two other pilots — a reserve officer and a first officer — assumed the controls. “The crew on this flight included an additional relief pilot, who took the place of the deceased pilot,” she said.