Riley
From The Stargate Omnipedia
For other uses of this name, see Riley (disambiguation)
Colonel serving at Stargate Command, assigned as base commander of the second Alpha Site. Upon the arrival of Goa'uld ships into the system, Riley ordered an immediate evacuation to the Beta site and remained behind to make sure the base's self-destruct mechanism was not disabled by Anubis's invasion force.
The successful detonation killed Colonel Riley, but also took out several Kull warriors and protected vital Earth-Tok'ra secrets from falling into Anubis's hands.
KEY EPISODE
Death Knell - Colonel Riley sacrifices himself when he stays behind during an Alpha Site evacuation to make sure the self-destruct is detonated.