. >> even though marjorie deal armstrong had been talking to police, it took the fbi four more years before it could tie up all the loose ends. everybody, the fbi said, was involved in the robbery. bill rosstein, marjorie deal armstrong, even another suspect, a crack dealer named kenneth barns and barns claimebrian wells was in on the plot from the very beginning. >> wells was essentially told he would be robbing the bank, but the device that was being put around his neck was fake so he would not be putting himself in harm's way. as it turns out, he was double crossed. >> criminologist jim fisher says it was rosstein that wanted to pull off the elaborate scheme. the confusing yet meticulously crafted collar bomb, even the white t-shirt brian wells wore into the bank, spray painted with the word guest, to bill fisher, all masterminded by a mad man. >> we knew we had a category of crime involving motive of a normal person you can't really understand. >> you're describing bill rosstein. >> that would be bill rosstein in my mind, he fits to a t, the kind of person that would commit such a