Demtri, brother of Gerlun, was a member of the Malevolence, a Dark Jedi cult that lived in Andeddu's Keep on Prakith. When Darth Wyyrlok III appeared at the Keep to learn Darth Andeddu's secrets, Demtri and the other Dark Jedi confronted the Sith Lord. They were, however, no match for Wyyrlok's mastery of the Force and, under the influence of a Force illusion of multiple Wyyrloks, Gerlun struck down Demtri.