Family had to get one of our cats euthanized today. She was thirteen years old, she had a bad tumor in her digestive system. Mom and I kept having to feed her with a syringe because she would refuse to eat, and she couldn't walk as steadily or as quickly. She was an old kitty, and I didn't interact with her much (she liked my mom best), but god I miss her. She purred a bunch at the vet's office, so I guess she was happy in a way to pass on.
Make sure to hug your cats everyone.
Kitties are 100% the best. Still got two around the house, family got them less than a year ago, they're the sweetest cats around (subjectively). Will still miss the older one, but I take comfort in the fact that she's in a better place, wherever that place is.
Awww. Glad you have other cats to help you through.