john lewin.lt of cold cases. >> do you remember when you saw the results of that interview what you thought? >> yeah, i thought that his memory had grown in areas where it shouldn't, and in areas where he should be saying the same story, it was different. that's the hallmark of deception. >> sure. but the mind plays tricks. the mind invents things and inserts them into your memory and you believe them as strenuously as if they actually happened. >> that's an interesting theory. i don't think it's really supported. memories can be lost. but memories don't increase in details over the years, and they don't increase in different details and that's a sign of what we call a lie. >> his version of what happened from the start made no sense to any of us. >> this is what makes the case. >> reporter: and why would mike lie? to the cold case team it seemed obvious. >> he killed her that night. she stopped living that night. everything else that's going that doesn't make sense is all because it's a lie. if