From Halopedia, the Halo wiki
Natalie was born to former SPARTAN-II Randall Aiken and his wife on the planet Vodin. Natalie's mother had died during childbirth, leaving her father to raise her. After completing some deals for the Office of Naval Intelligence, Randall left Vodin with Natalie and emigrated to the remote Outer Colony of Sedra.
Following a Sangheili terrorist attack on Sedra, Natalie was among those who were affected by the element of an unknown bioweapon. She later died at the Sedra Colonial Guard Hospital. Her death motivated Randall to accompany ONI agent Jameson Locke and his team to a partially functioning fragment of Installation 04, from which the bioweapon emanated, in order to neutralize it.
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