In 2346, he moved to the colony on Khitomer. He had decided to collaborate with the Romulan Star Empire. He transmitted the colony's defense codes to the Romulans, who used the codes to lower the colony's deflector shield and attack. In the ensuing massacre, over 4,000 Klingons were killed, including Ja'rod and Mogh. On the family crest of the House of Duras, Ja'rod was represented by a symbol. (TNG: "Firstborn" )