Ellen Marcus
From Halopedia, the Halo wiki
Summary
Ellen Marcus is the wife of Tech Officer Sam Marcus. She is never seen and she seems to live on the planet Earth. She and her husband have not seen each other for years (Due to the Covenant threat) and it is noted in Halo: The Flood, that they have children. She has probably been informed of his death by the time Halo 2 takes place.
