john lewin. lewin specializes in tackling the most difficult of cold cases. 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 was different. and that's the hallmark of deception. >> sure. but the mind plays tricks. the mind invents things. and -- 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 -- >> and why would mike lie? to the cold case team, it seemed obvious. >> he killed her that night. she stopped living that night. and everything else that's going -- it doesn't make sense. it's all because you know it's a lie. if you kno