My brother in law is an MD. Years back, he was explaining end of life medical problems to me while his father was failing. I believe what he told me applies here. "Sometimes you can't make something better without making something else worse, and in the end it all gets worse." We don't need to know how that happened. We don't need to speculate. The coroner can't even know for sure. Tom Petty left us a legacy of great music that we can listen to until it gets irreversibly worse for us. For me, I'm going to leave it at that and maybe say a prayer.