After Jacob Keyes requested that Jeffries and his Pelican be transferred to the Light Frigate UNSC Midsummer Night, Jeffries transported Keyes, ODST platoon commander First Lieutenant Canfield, and a platoon of ODSTs to the civilian Freighter Finnegan's Wake. Finnegan's Wake turned out to be an Insurrectionist ship that was rigged with bombs.
Gamma 054 was destroyed, but Jeffries managed to survive. He was later killed when his new Pelican was shot down by an Insurrectionist RPG during an attempt to extract Lieutenant Keyes.
- Halo: The Cole Protocol (First appearance)