From Halopedia, the Halo wiki
Chris was a UNSC Marine aboard the UNSC Spirit of Fire.
In February 2531, the Spirit of Fire was sent to assist the crippled Marathon-class heavy cruiser UNSC Prophecy in the Epsilon Indi system. Captain James Cutter ordered the Prophecy's navigation database and survivors to be recovered, sending multiple marine fireteams as Covenant forces moved in on the damaged ship. Chris was killed while co-piloting a Pelican with Sergeant John Forge as they attempted to board the Prophecy.