A. It could be either a seizure episode (atonic generalised) or a cardiovascular '' accident'', which would be categorised as a syncope.
Underlying heart disease causing severe arythmia is possible in these cases. Usually with seizure they are not conscious though.
I would recommend a consultation to identify precisely the problem. Further test may be needed (cardiac scan, radiographs and blood tests).
A. Sudden death in cats can be related to many conditions, the most common being: tumors, infectious diseases (FIV/FELV/FIP), foreign body blockage, urinary blockage, acute kidney failure, intoxication (could have eaten poison outside) and the list goes on. If there have been any other symptoms prior to his death that could give us a few clues.
I'm sorry for your loss.
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