We DO KNOW something. They told us! She was murdered. They said it out loud and in writing and it was televised. We don't know HOW or WHEN or WITH WHAT but her death was NOT 'natural,' it wasn't an 'accident' nor a 'suicide' and it was able to be determined based on the autopsy. I don't know why you want to insist that it could be something else when it simply isn't. There are LOTS of things to speculate about if you're feeling so inclined, but the manner of death is not one of the things that will change. It was a homicide and it will stay a homicide.