dissected the procedures at the hangar and he found that erwin howard could swipe into work at the employee parking lot using a key card at this turnstile ian then clock in inside the hangar. but he could also leave whenever he wanted by walking out the large bay doors and catching an employee shuttle back to the parking lot. there would be no record of his leaving. jimmy gates discovered that on the night of the murder, erwin used his key card to swipe into the parking lot at 8:24 p.m. and again at 10:21 p.m., and for a third time at 1:47 a.m., which completely blew apart his alibi that he had been at work the whole time. so he would swipe his card to get back in. >> absolutely. >> reporter: after there was no record of him leaving? >> right. >> reporter: by now you're convinced erwin is the guy? >> absolutely. all of the witnesses, all of the