From Halopedia, the Halo wiki
Satha was stationed aboard the UNSC Pillar of Autumn and like all other ODSTs, used a Human Entry Vehicle to abandon the ship when it crashed into Installation 04. Once on the ground, the Marine was under the command of First Lieutenant Melissa McKay and was one of the ODSTs that helped capture the butte that became known as Alpha Base from the Covenant. While there, the ODST pointed out to the Lieutenant that the structures of the area appeared to be ancient and unlike standard Covenant technology, the first indication that the installation was actually Forerunner.
What happened to Satha is unknown, although it's likely the Marine died before or when the Master Chief destroyed Halo.
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