Hiya
I am really sorry that you have already lost one.
The first and most important thing is to take it away from any other reptiles while you decide what to do with the body, just in case whatever it has died from is contagious. If you have any reptiles that have been near or in contact with it, I would get a post mortem done so you can limit potential infection to your other animals. If you don't, then be extra vigilant around the body and maintain really good hygiene between your reptiles, monitor the other's health carefully and any problems, straight to the vet.
After that is up to you, like disposing of any pet, it is what you feel comfortable with x