My cat died under general anaesthetic

(Part two) On the day of the procedure, we dropped Mimi off at the clinic in the morning. She wasn't stressed; she's used to the vet and is a very 'trusting' cat. The vet (vet number 2) was supposed to call us in the early afternoon to let us know when we could pick her up. Two hours later, the shock: vet 2 calls us and tells us there was a problem, that Mimi had a cardiac arrest a few minutes after the anaesthesia induction and they couldn't bring her back! At the time, I was in such a state of shock that I didn't ask for a post-mortem (especially since vet 2 told us several times it wouldn't be worth it). Anyway, I didn't want anyone touching her little body anymore, as I felt like I'd already 'over-medicalised' her and that’s what killed her. The vet said she followed the standard protocol and that it's very rare, but it does happen. She said maybe Mimi had a heart condition or lung metastases (but if she had metastatic cancer, she was hiding it incredibly well!). She says it can also happen without explanation, just a freak accident. But it’s gutting to know that the most exceptional cat I've ever known might have died from a stupid accident... The only thing that might comfort me is telling myself she was ill and that her condition would probably have gone downhill quickly after that, but I can't even cling to that belief because we'll never know: vet 2 managed to do the biopsy, but since she died on the operating table, they didn't send the sample to the lab.