Killed him tonight. I know one of the positive factions was with the Pirates of Gunthak.One other 'bad guy' faction and three negative 'good guy' faction. I had not met him in the tunnels until tonight and had never even heard of him. Been through the tunnels many times, too.
Had my Iksar monk in the tunnel to DL, and he (my monk) was feigned at the time because the private had just gone by and blasted me (guess I still have a way to go on FV faction I've killed about 600 - 700 goblins, actually counted 500+, but started killing them long before that) anyway, he was walking around in a path that seemed almost random like someone was at the keyboard just wandering around. When he got to me, he stopped, paused a moment, and then walked off. Maybe that was just his normal resting place, or maybe he was checking me out to make sure I was dead, silly guard. lol