Nice little report at
Cabin attendant aided 767 landing after co-pilot incapacitated: inquiry
about an Air Canada 76 captain who noticed the first officer was getting unwell.
There were no off-duty or positioning pilots on board, but one of the stewardesses had a CPL and out-of-currency IR. The best that the skipper (who seems to have handled the whole situation very well) can muster to compliment his co-opted right hand seat assistant was that she was "not out of place" there.
Well done all concerned. No news about the real first officer's recovery, though.