LEDGER DIED OF NATURAL CAUSES?

Though it seems remarkable, TMZ quotes sources "intimately connected" (hubba, hubba!) with the Heath Ledger investigation and they say that there may be no sinister or mysterious cause of his death, and he simply died of natural causes.  TMZ says:

The reason they think that — it's now appearing that the level of toxicity (from medication) in Ledger's system was low enough that it may not have caused his death. These sources say Heath's heart stopped. It could have been a heart attack but it's not certain, at least not yet.

The sources went on to say, "welcome to the year 1241, where 28 year olds in the prime of life drop dead.  We suspect sorcery!  Crow fly from moon, bring evil!"  Then the TV came on and they threw it on the ground and cracked it open with some rocks sharpened to a simple yet effective cutting tool.