Sorry for commenting on your post like this but.. I've never seen any of cats after death. On some level, I wish I could have.
When I was young, we had 4 cats of different ages. When my little brother got allergic to cats, we had to give all cats away, even though I loved them all. Three of them found homes, one of them didn't so my mother had to put it down and it was buried under a tree in our garden. I wasn't very old back then, but I feel like I never processed through this properly as I have a very confused feeling when I think about this.
Two cats found their new home together, however one of them was ran over by a car and I felt bad, especially for the other cat as it lost a friend. If I remember right, I heard it died too after some years, I don't remember why.
The fourth cat, the oldest one, lived the longest. It's still my favorite cat, even though it's dead now already, lucky she died of old age. She lived with an old lady, but the old lady had to go to a surgery so the cat came back to our house for few months so the old lady could recover. My brother (and the rest of us) had moved out so it was ok again, but we saw the cat when we visited my mother. Even after she got back to the old lady, she lived a long life. She too was something like 18 years old when she died.
The problem is, I'm not sure how to think of them as they're dead as it doesn't feel like that. I can't explain it, but sometimes when I think of them, I forget they have passed away. They all have died far from me or without me being present in any way.