The key statement is -

"Details as to the circumstances around the tragedy and the actual cause of death are still pending."

If an autopsy and investigation is published there is much to learn. Otherwise it may all be lumped into speculation. Location and condition of his pack would be of utmost importance in speculation of cause of death.

Heart attack.
Stroke.
Pulmonary edema.
Electrolyte imbalance.
Heat stroke.
Concussion.
Drugs.
Poison.
Murder.