My Crested Gecko has just died of a disease. It didn't eat for th whole time a had it!?

he could of defiantly had a infection in his mouth and tummy if he wasn't eating and also parasites.. were you feeding him meal worms? never ever feed any lizard or gecko meal worms b/c they burrow in there stomach and eat they're insides slowly... you have to cut off the head and tails of them in order for them not to but that's why i only feed them crickets.. but no smaller than the space between they're eyes!