What a bummer. I've liked his work ever since Ten Things I Hate About You. So sue me, I have a thing for teenage Shakespeare remakes.
It's such a shame to see someone with such talent go at such a young age, regardless of the cause. I'd like to think that if it was an overdose, his death will serve as a reminder to those thinking of dabbling in controlled substances, but we all know that won't be the case, which makes it even more of a shame.
Regardless of how he died, my condolences go out to his family and friends.