From Halopedia, the Halo wiki
In 2553, Hume was reporting exposés on the Office of Naval Intelligence that were being broadcast by the BuzzCast. He showed a considerable bias against Spartans, with one of his stories claiming the supersoldiers were behind a supposed meteor impact on Tanuab III. At some point Hume was contacted by Ota Gallo, a former ONI agent now working for Dark Moon Enterprises. Seeking to undermine ONI for Dark Moon's gain, Gallo fed Hume information on the SPARTAN-III program, particularly Gamma Company. On October 14, Hume managed to gain entry into the officers' club at UNSC Recreational Facility 6055-NA-A on Neos Atlantis, where a Ferret Team led by Veta Lopis was conducting an undercover training exercise.
Hume spotted Olivia-G291, undercover as a Luna OCS Academy graduate, and started talking to her; unaware of Hume's identity, Olivia played along. With Gallo posing as a server, she and Hume gave Olivia a glass of zantelle laced with nicothiotal, drugging Olivia in an effort to get information on the Spartan-IIIs. Unfortunately for Hume, Veta Lopis realized what was going on and ordered Mark-G313 to arrest Hume. Mark used a wrist lock to force Hume out the emergency exit into a hallway. However, Hume was resisting which distracted Mark, making him unable to see Gallo moving to attack him with a knife. Mark instinctively used Hume as a shield to block the knife; when Hume continued to resist Mark punched him in the chest, killing him. Mark and Ash-G099 disposed of Hume's body out an airlock. Veta later framed Gallo for Hume's murder, claiming Hume was going to name Gallo as his source.
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