Sudden death of my Star Tortoise

by Carrie
(Singapore)

My star tortoise shows signs of lost of appetite and had a few diarrhea during the past two weeks before it passed away today. I have tried to change it's diet by giving different kind of vegetables, hopefully it will bring it's appetite back to normal but it didn't. There were no signs of runny nose nor teary eyes and i just couldn't tell what was wrong with my star. I could not bring to a vet in my country as the star tortoise as i wasn't sure if the local veterinarians would be able to treat tortoise. I am extremely sad that it has died today with his head stuck inside his shell and a drop of nasal discharge on the right nostril. Can you tell me what was wrong with my star?