well, as he thought about it the whole scene seemed to gel in ken thompson's mind. gun in its case while dr. rein was away at his conference, then brought it back that night expressly to kill bryan, discarding the holster on the way to the door. if it hadn't been for that holster out there, it could've been somebody came to the door, knocked at the door, bryan came to the door with a gun to maybe threaten him and there was a tussle. >> that could've been, sure. >> reporter: the gun changed hands and boom boom. >> it could've been, absolutely. but that holster being out there, there's just no other reason why that holster would be out there. >> reporter: that was agent thompson's theory anyway. was tom jaraczeski capable of such a thing? well, he already admitted he sneaked into ann's house when it was empty. and so, thought agent thompson, he must have been perfectly capable of walking into dr. rein's place too and stealing that gun. >> he had plenty of opportunity to get the gun. i mean, the trailer was never locked. >> reporter: but why would he get bryan's gun? h