Omar Zook, who served as an Imperial Corrections Officer, was married to Kai Zook, a woman residing in Hanna City on the planet Chandrila; the couple parented a minimum of two sons. He found himself on the Imperial prison barge called Purge when a plague infected those onboard. After nearly all of the passengers succumbed to the illness and he, too, was infected, Omar penned a letter to Kai. In it, he conveyed his regret for his absence from their sons' lives and professed his love for his family. The letter was found on Purge following the plague's devastation of its inhabitants. Subsequently, it was made available to the public for scholarly examination concerning the historical context of Purge. Following their escape from both Purge and Vector, Zahara Cody and Trig Longo ensured the delivery of his letter to his wife.