. >> so the local tv station, kwtv, sent the tape to a company specializing in computer voice stressnalysis. the test charted the microtremors in dr. hamilton's voice. it showed no excessive blood flow impacting dr. hamilton's voice. >> on this, i'm very confident that this doctor is not stressed to the degree that i would think that he would be under those circumstances, which makes me feel very confident that he rehearsed this before he made his call. >> the analysis couldn't say, yes, he did it or, no, he didn't, but it certainly gave an insight into maybe there was something more to the story that we didn't know. >> please, please, please. >> and homicide investigators started to question dr. hamilton's unusual behavior captured on videotape just after the murder. >> he seemed to be out of control with emotions, one way or another. he would get upset and start moving back and forth. he would start crying, he'd stop. and that is one of the concerns that i had. it was almost like he was acting. >> but dr. hamilton had an alibi for the time of the murder. he was in surgery all morni