I've heard both versions of her death, though I can't link to scans for either one, I'm afraid. I've also seen a version where it was a combination of both (I believe she became ill, presumably with HIV/AIDs, through a contaminated needle, and died as a result of that), but that was in fanon.
Regardless, I don't believe there's definitive canon that would make it either, so it's up to your discretion, I suppose.