If, as the Rolling Stone piece suggests, he took too much Ativan I suspect he must've done so before the show rather than after.
After reading Default's post ("fear of living..") I was wondering if he was possibly on meds for something like Bipolar disorder, as those meds can be almost as bad and sometimes, to the sufferer, even worse than the disease.
Apparently his wife has confirmed the Ativan overdose, that he told her he took a "couple of extra", and looking it up just now I see it's a benzodiazepam just like Valium which gained notoriety in the late '70's.
While I don't think it's a common treatment for BD, it is commonly prescribed for depression and overdoses absolutely cause short-term memory loss and poor co-ordination and suicidal tendencies.
The thing that strikes me here is that it's possible to literally forget how many you've taken.
I never understood how that could be possible with
anything when I was a young party animal but I get it now.
My heart goes out to his family even more than regretting the loss of another great artist.