Show me a documented case of someone dying from fasting other than doing something stupid like drinking excessive quantities of water or having underlying health issues that they actually died from.
“the primary hypothesis of the study was that excessive consumption of hypotonic fluids is associated with hyponatremia in marathon runners. ... Both water and a sports drink containing electrolytes were offered at each milepost, and runners were asked to estimate the proportion of their intake from each.”
http://www.nejm.org/doi/full/10.1056/NEJMoa043901
Did they?