My aunt died at 31 of an aortic aneurysm, and she wasn't a cokehead. She was a heavy smoked, and that probably had something to do with it, but she certainly wasn't a druggy. You CAN die of heart related complications at a young age without being full of drugs...
That being said, it is Hollywood and there is a certain likelihood.
But seriously, that one is a big shocker. I'd bet no one picked Britany in the celebrity deathpool. it's a shame, I found her really sexy in a "trailer park princess" sort of way...