stuart henderson will tell you we looked at bollier 100% as a suspect. i treated him like that. i treated him like a suspect. >> dornstein: hold on, we'll get reset. i want everyone to get back in there. >> but i also thought, "this guy's a witness. we want to treat him like a witness." because we wanted to know what's his answer going to be, "do you know who blew up pan am 103?" >> dornstein: ready for take-off. >> rolling. >> next time on "my brother's bomber"... >> the cockpit landed in this field over here. the lights on the instrument panel were still lit. >> from libya... >> am i going to make a scene and go into the room and say, "did you murder my brother?" >> to zurich... >> there was a man there. he was still in the same office, same place where the timer that they say had blown up flight 103. >> wow. >> next timfrontline, ken dornstein's search continues. >> go to pbs.org/frontline for more about the search for answers in the bombing of pan am flight 103. >> lockerbie's still an open case that somebody has assigned to him. >> explore an interactive guie to filmmaker k