Wow, what a bummer. I can't imagine what I'd do if that happened to me; but, having a necropsy preformed would be expensive, and in my opinion, useless because your star probably died as a result of lack of proper husbandry. It could have started before you got him because most, if not all torts, will mask what ails them and go on as if nothing is wrong until it's too late. Sorry for your loss.