Bring your cat to the vet
Just came back from dropping some newsletters by a vet. If you see that your cat is not eating, looks under the weather or is listless, please bring it to the vet. This is whether it is your pet cat or a community cat. Someone wrote into say that their cat went off food a few days ago and today it died. It is important to get proper medical care.
People often write in and say that their animal is sick and they try and describe their symptoms over email. As much as I'd like to help, I'm not a vet. Furthermore, it is very difficult to diagnose without seeing a cat. It's best in this case to be safe rather than sorry.