When Marduk went to an abandoned fight arena, during his Tekken 4 ending, Slater appeared and challenged him to a fight. Marduk ignored him and tried to leave, but was stopped in his tracks by Slater, who accused him of running away and being scared of seeing "legendary fighter KO'ed" in the headlines. Jeff was eventually taken down by a single headbutt by Marduk, who proceeded to step on him as he left the arena after telling him to not get up.
Going by first impressions, he seems to be an egotistical, judgmental, and self-centered man.
- Was defeated by Craig Marduk.