Not a kitty I adopted, but one I was planning to...I was house-sitting for my boss, and she told me about a teeny feral kitten she had been feeding and trying to trap. On the last day I was there he was asleep next to the food and I was able to pick him up and stuff him in a carrier (Red flag #1). I immediately took him to the vet where he tested positive for FIV and FeLV and was euthanized later that day. I wish I had had some treats to give him or a heated blankie or something to make his last hours more comfy.