SPARTAN-073 was a SPARTAN-II candidate. Along with the other candidates, he was abducted in 2517. In 2525 his body rejected the augmentation procedures and he died as a result. John-117 witnessed his death.
Almost nothing is known about SPARTAN-073. He was born sometime around 2511 as an exceptionally fast, intelligent and strong child, making him a candidate for the SPARTAN-II Program. In 2517 he was abducted by the Office of Naval Intelligence and taken to Reach for training. On March 9, 2525, SPARTAN-073 and the other SPARTAN-II recruits were taken aboard the UNSC Hopeful for their surgical augmentations. At some point during the procedures, 073's body violently rejected the augmentations, resulting in uncontrollable muscle spasms, and ultimately death.