Answer:
Their are many ways a cat can die.
1.If their is blood in the urine or feces.
2.If that cat has a terminal decease .
3. If the Cat REFUSES to eat .
4.If a cat refuses to drink .
5.If their are an excessive amount of worms in the feces of the cat.
6.The cat has trouble breathing .
7.The cat is making choking noises.
8. A Cat can die from worms without many visible signs .
9. The cat will not move .
10. Sleeping too long.
ADD:
PLEASE NOTE that this list does not meat a cat will die if it has one of these symptoms. Many of these symptoms mean there is something wrong with the cat, and aside from a cat having a terminal disease, all these symptoms can be treated and cleared up with the correct care and medication.
If your cat gets any of these symptoms, or its behaviour changes in any way, it is highly recommended that it is seen by a vet immediately.