The whole world came to a standstill with the death of Shane Warne . No one ever thought he would die so soon. In fact, death never comes to anyone. And whoever is born has death, it must be accepted. The amount he has recorded in the history of cricket is unimaginable. It goes without saying that there is no second leg spinner like him. I pray for him to be well on the other side.
I would say he is the second one the number one is Murli dharan of Sri Lanka. Both have wonderful contributions for there country. Its my personal choice to rate Murli as number one spinner.
"The autopsy in Thailand has confirmed death by natural causes" source. So we have a conclusion that his death is natural and there is nothing suspicious about death of this legendary spinner.