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Hi. Welcome to Just Answer. My name is***** If you think about it, cats have been hunting mice as a food source for many, many, many years. It is in their instinct to do this. So it is a very natural thing for them to do this. Can a cat die from this? It is extremely unlikely. If my own cat killed a mouse, I wouldn't be concerned that it would cause an illness. With your cat vomiting at this time, if she didn't eat it, then it would seem very unlikely that this is causing this. How long has the vomiting been going on?