I am willing to bet they killed him via the refeeding syndrome. If you give anything that raises insulin to someone who has fasted hard (without water) or long (over a week) you, dear doc, can kill him. Insulin depletes the already low phosphorus in his blood (shuttles it into all cells, regardless of the cells' needs for it) and that means some cells don't have enough phosphorus to create ATP while the metabolism ramps up severely fast. Cell die, organs die, patient dies, and the docs are happy that they did all they could for him.