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Hello, this is Dr. Jess. I am sorry to hear about your situation. The problem here may likely lie in the fact that you were indeed feeding both cats (I assume the other cat is healthy, which would provide evidence that you weren't purposely starving the cats), but only one cat was eating. If the tenant didn't ask you to ensure the cats were eating or regularly look in on them, then this could have happened. People tend to think cats are self sufficient and just having someone feed them will suffice, but if she was gone for weeks, they truly did need more than just someone putting some food into their bowl daily... Many cats would do just fine with this, but if there was an underlying health issue that caused one to stop eating, this obviously can become a dangerous set up. It sounds like this is just a very unfortunate series of occurences.
I would have the other cat examined by a vet to provide evidence that the cats were living together and food was provided. If you had truly been "starving" the cats, then both of them would have been starving, not just the one. I think this might be the key here.
The hard part I think will be proving you did what was asked of you by the tennant, unless there was something written or a phone text or something saying she just asked you to feed the cats and nothing else, that is probably going to be the tough part.
Perhaps if you can get a vet to examine the second cat and say that it was not deprived of food, they will be willing to give this statement, which will provide evidence you weren't neglecting your agreement.