Sorry, wasn't meaning to give him 'an excuse', just pointing out that being tee-total doesn't guarantee protection..
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I don't think the liver was the cause of the accident rather things point to the excessive amount of alcohol in his system. I am no Dr and I am sure frank will comment but the fatty liver and the extreme amount of alcohol could indicate a longer term problem than a heavy session the night before.
It seems clear that alcohol was the route cause and for a professional pilot to be that far over the limit would indicate ether a problem or a total disregard for the rules. Either way an accident waiting to happen.