so this is what Dave had to say...
I just finished the necropsy. The lungs had a lot of clotted blood along with some yellowiness of the lung sack as if it was infected. The liver had some deposits that looked like fat but not too bad. The heart was great, kidneys fine, no parasites in smears from several areas. His blood sample was parasite-free too.My guess is that the lungs are what succumbed to whatever killed him rather than kidneys or heart or parasites.
my grams thought he was awesome.