it's an easy one to jump the gun on because many (outside of supporting Freo) would have been aware of when he collapsed and was diagnosed. Struggling with epilepsy could be enough to trigger a young guy, but guess we wont get an official explaintation for a while.
I hope it was epilepsy to be honest. While it is terrible to die that young of natural causes at least that means McCarthy may have been happy in his final days.