We had another kitty before we rescued him that died of kidney failure. She showed many advanced signs of the disease for a few weeks. Ted, our orange kitty, didn't. Just the day before he was his normal self, running and playing, and yelling at me. :) But when I woke up yesterday morning, he couldn't move. So I just held him until he passed away in my arms.
We are a heartbroken family right now. Our pets are our family members, and we just said goodbye to a very handsome boy.