There are people who still believe Heath Ledger committed suicide or overdosed on illegal drugs because of the early speculation, both of which are untrue.
Actually, from what we know, Heath Ledger in fact did die from an overdose of "illegally obtained" drugs, as I understand: a cocktail of prescription cold medicines no reputable physician ever would have given him.
Regards Brittany Murphy, she had a reputation for drug use that was well-known in the Hollywood community, to the point that it was satirized on SNL. Frankly, this death strikes me as closely similar to that of Michael Jackson, which also initially was reported as "cardiac arrest", and which we now know by official report was due to a massive overdose of a non-prescribed (and probably illegally-obtained) potent anaesthetic drug, court proceedings pending.
This does nothing to mitigate the tragedy of her death. In fact, if drug use turns out to be true, it ought to generate anger, in addition to grief. Look, they might find, via autopsy, that she had some undiagnosed congenital heart defect, and it killed her. The valedictorian of my high school class, a close friend of mine, a state champion track athlete who got an athletic/academic scholarship to Yale, died of exactly this cause at the age of 21 after a casual round of tennis with a friend just before he was to graduate. It happens, and maybe did so this time. But the signs are disturbing, at best.
caw