A 65 years old retired soldier, a case of Mild Hypertension on medication applies Henna (Mehndi) to his hair, takes bath with cold water at around 1 PM (in the month of Jun) and sleeps on the floor apparently cool place in summers exactly underneath the ceiling fan and never woke up. When his spouse went there to wake him up at around 4 PM, he had breathed his last.

What could be the probable cause of death? Kindly share your valuable views.