OK. Bad title for this thread. It has absolutely nothing to do with any purported castle doctrine.
Given the details in the article referenced by the OP, I can't decide if this is a case of justified self defense or did the perp simply OD?
I'm leaning towards an OD. If I'm correct, the State spending this kind of money to decide if this was a homicide is simply ludicrous.
Off to correct the title....