Katherine Toomajian was a Starfleet officer who, as of 2381, held the rank of Commander, and was assigned as first officer of the USS Malinche under Captain George Sanders.

According to Casualty Report 92792382 Baker, Toomajian was killed in sector 22093 during the Borg Invasion of 2381. Sanders recommended her for a posthumous honor for bravery. (ST novel: A Singular Destiny)