Lost my best friend yesterday

I feel you.
The wife and have a cat we're on watch with.
The vet diagnosed him with cancer a couple weeks ago. Said he would progressively get worse.
She wasn't lying. It's just a matter of time now. When he stops eating and purring, then I guess we have to take a ride.
For a cat, this one is a good dude. He was feral kitten that I caught under my MIL's porch and he came around quick. Probably one of the most lovable cats I've ever had.