I've had a few cats die on me, but most were when I was younger so I wasn't as attached to the cats as I might have been. When I was like maybe 7 or 8 though, my dad brought home a cat from a friend at work or something. His name was Timmy and I loved him and he was kinda "my cat". Anyway, about two and a half years ago he just didn't come home (we let our cats outside). It was in the winter so that was concerning, but he had been stranded outside in a blizzard before so we were sure he would survive. We went looking for him a few times, and even thought we found him once with someone else, but no such luck. To this day I don't know what really happened and it's pretty sad. Anyway, last year in art class we had to do this project where we wrote a children's book, and for some reason I decided to write it about him. The plot was that the reason he left was to go fight a the red barron (who was a squrriel) in an airplane duel, but even though he won, his plane crashed and he was stranded in France (this is all a ww1 reference) which is why he hasn't come home yet. After I wrote it it kind of gave me closure though, which wasn't really my intent, but it helped. I hope this was helpful and I'm sorry about your cat.