Although initial reports claimed that Heath Ledger died from a drug overdose – accidental or otherwise – now it appears that they might have been way off the mark.

Because now sources apparently close to the investigation into Heath Ledger's death suspect that he may have died because his heart just stopped. Whether it was a heart attack or something else – or whether these natural death claims are completely inaccurate – remains to be seen. But if it is true, then at least Jack Nicholson was wrong the other day.

And that's always heartwarming news.

There's always such a sudden flurry of speculation whenever something as blindsiding as the untimely death of Heath Ledger that it's hard to unearth any sort of truth. But now, almost a week after Heath Ledger died, things are starting to make themselves a little clearer.

In the wake of his death there were reports that Heath Ledger was suffering from pneumonia – disproved during Heath Ledger's initial autopsy – reports that Heath had deliberately taken his own life because, as claimed by a friend of his, "everything was misery for him," and reports that his death was drug-based but purely accidental. And Jack Nicholson seemed to claim that Heath Ledger took a sleeping pill and drove off a cliff, although who knows what the hell he was banging on about.

But, if the latest news is to believed, each of these theories is completely wrong. According to TMZ, Heath Ledger's death might be put down to natural causes and nothing more:

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. Although it's bizarre that a 28-year-old could die of natural causes, it happens.

Now, there still haven't been any official announcements – no toxicology reports revealed and no statements from coroners – but if TMZ's sources are as close to the investigation as they claim to be, then it's definitely an encouraging sign. However, if Heath Ledger's heart did just stop then it will only raise more questions of why? Stress from his insomnia? Was it weakened by the drugs that Heath was claimed to have been addicted to?

Hopefully soon we'll all know for certain.

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Heath's Death Could Be Natural Causes – TMZ