Thats too bad..
One suggestion in the future that has worked for me...
When I have a fish that stops eating, I try to yank them out of the tank and put them in a QT. For some reason and it could just be me, but fish tend to eat better in the smaller QT with nothing in it. Whether that would have helped, who knows really. Again, this is just my experience....
Sorry for your loss, it always sucks to lose a fish expecially such a cool one like that!