Source : Webster's Revised Unabridged Dictionary (1913)

Fatally \Fa"tal*ly\, adv.
   1. In a manner proceeding from, or determined by, fate.
      --Bentley.

   2. In a manner issuing in death or ruin; mortally;
      destructively; as, fatally deceived or wounded.

Source : WordNet®

fatally
     adv : with fatal consequences or implications; "he was fatally ill
           equipped for the climb"