in a manner leading to death or disaster: He was injured fatally in the accident.
by a decree of fate or destiny; by inevitable predetermination.

1375–1425; late Middle English; see fatal, -ly

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World English Dictionary
fatally (ˈfeɪtəlɪ)
1.  resulting in death or disaster: fatally wounded in battle
2.  as decreed by fate; inevitably

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1570s, "predestined," from fatal + -ly (2). Meaning "in a deadly manner" is from 1590s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Cloning an animal is a complex process that can go fatally wrong at any stage.
But a traveler half-crazed by thirst could go fatally astray while pursuing
  such a vision.
If some of them get caught in a downpour during cold weather, he's fatally
  behind the curve.
The hypothesis is fatally shot through from the get-go.
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