michael belenky. how many times did you hear the name michael belenky? >> i can't give you an accurate answer as how many. but his name came up again and again. >> reporter: dr. belenky was a former resident who'd had left the pathology program and threatened to sue creighton a year before the murders at dr. hunter's home. >> he had had some trouble during his time at creighton university, but they weren't unlike other people's troubles. but he was just a little bit more boisterous about his -- i guess his perceived treatment by creighton university and some of the staff there. >> reporter: dr. belenky told detectives he'd been working in pittsburgh on the day of the dundee murders. pittsburgh's like 900 miles from omaha, so -- >> correct. >> reporter: you're not driving that in a day. >> correct. >> reporter: presumably you're not doing that without air travel. >> right. >> reporter: and air travel's something you can check. >> right. we knew he was on the schedule. i believe we knew he had logged into his e-mail account at that facility that day. >> but nobody actually saw him at work. >> right. but there was nothing to show