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=Biography=

According to the E3 2000 demo, Sigurd was serving on the Pillar of Autumn in 2552, which crash-landed on Halo. There Sigurd and the rest of his squad where to infiltrate a Covenant held bunker. Sigurd and two of his teammates drove there on a Warthog, Sigurd driving, while the other three members got there on foot.

The rest of the squad broke into the bunker, but Sigurd was killed in the process, hit by several Needler rounds in the back, as he was trying the retreat down the hill.

It is assumed that the other members were either killed in skirmishes with the Covenant, infected by the Flood, or killed when McKay destroyed the engines of the ship.

Trivia

 * The E3 2000 demo was shot while Bungie was still working on the game. Some aspects of the demo there couldn't be canon; for instance, the Master Chief was in the demo, while in both Halo: Combat Evolved and Halo: The Flood there was never a mention of the Master Chief participating in such mission.
 * It is likely that the name is a reference to Sigurd, a legendary Norse mythological hero.