Sharon Wallace was the daughter of Henry Wallace.
She suffered from leukemia and lost her mother in 2004. To stop her from dying, her father implanted her with nanites to save her, but it had the opposite effect he desired. He kidnapped Dr. Rodney McKay and his younger sister Jeannie Miller in order to perfect the coding, which worked for a short time. She seemed cured, but she temporarily died when the nanites shut down her heart to repair her heart murmur. She suffered from internal bleeding. The nanites tried to repair her blood vessels, but they eventually ran out of energy and she died. (SGA: "Miller's Crossing")