Heath Ledger may have had no intention of killing himself, but if not there is no doubt that he deliberately took what turned out to be a fatal comgination prescription downers to get fubar'd into oblivion. I think the operative term in the news report was "acute intoxication ".
Regardless of his intentions, It is a tragic loss of life - and I think it is underscored by how little is done to warn or prevent abuse of the highly profitable patented drugs approved by the FDA. Can anyone imagine what the results and outcry would have been if the autopsy revealed he had smoked some weed and taken a combination of dietary supplements?