Because "Natural Causes"(TM) is the brand name of heart-attack-inducing serum invented and used by the CIA for decades now.
Ding Ding Ding! We have a winna. My first thoughts exactly. The coroner needs to look at every inch od his body for needle pokes or do a full Tox screen, Wow sad state of affairs when we all think instantly its a conspiracy. But with Obama a devout Commie any thing is possible..
If I recall correctly what you point out has been a world wide situation for a number of years.