Nikkos was a terran who lived on Korhal and was a member of the planet's senate. However, in the early 2470s, he and his family were killed in their beds by a "crazed psychopath."
As a result of his death, Katherine Mengsk, wife of Nikkos' fellow senator Angus Mengsk, agreed to the construction of a refuge for the family's summer villa in the event of an attack.
McNeill, Graham (December 30, 2008). StarCraft: I, Mengsk. Simon & Schuster (Pocket Star). ISBN 1416-55083-6.