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Somebody. and then she would call me up. and we would just, like -- calling each other, going out to eat, places like that. nothing serious at the time. >> sam definitely was trying to limit his connection with cathy, give the impression that it's not that big of a deal. >> reporter: remember cathy's sister tina had told detectives sam had proposed to cathy just days before she disappeared. but when police asked sam about that, he denied it. >> you didn't ask her to marry you, then? >> no. >> reporter: later he changed his story but seemed to say getting married was cathy's idea. >> a lot of p...

>> it's -- it's an off-and-on thing. on-and-off thing. >> okay. >> reporter: tell number one, how sam talked about his relationship with cathy. >> see, i was going out with somebody. and then she would call me up. and we would just, like -- calling each other, going out to eat, places like that. nothing serious at the time. >> sam definitely was trying to limit his connection with cathy, give the impression that it's not that big of a deal. >> reporter: remember cathy's sister tina had told detectives sam had proposed to cathy just days before she disappeared. but when police asked sam about t...

Guilty people have tells, just like in a poker game? >> absolutely. they don't have that innocent mindset, and they -- they have other fears. they fear being caught. they can't get their stories straight because there's too many details. >> reporter: montgomery spent months carefully listening and re-listening, watching and re-watching, hours of sam's interviews. looking for the tells. >> how long have you guys been dating? >> it's -- it's an off-and-on thing. on-and-off thing. >> okay. >> reporter: tell number one, how sam talked about his relationship with cathy. >> see, i was going out with...

>> how long have you guys been dating? >> it's -- it's an off-and-on thing. on-and-off thing. >> okay. >> reporter: tell number one, how sam talked about his relationship with cathy. >> see, i was going out with somebody. and then she would call me up. and we would just, like -- calling each other, going out to eat, places like that. nothing serious at the time. >> sam definitely was trying to limit his connection with cathy, give the impression that it's not that big of a deal. >> reporter: remember cathy's sister tina had told detectives sam had proposed to cathy just days before she disappe...

>> okay. >> reporter: tell number one, how sam talked about his relationship with cathy. >> see, i was going out with somebody. and then she would call me up. and we would just, like -- calling each other, going out to eat, places like that. nothing serious at the time. >> sam definitely was trying to limit his connection with cathy, give the impression that it's not that big of a deal. >> reporter: remember cathy's sister tina had told detectives sam had proposed to cathy just days before she disappeared. but when police asked sam about that, he denied it. >> you didn't ask her to marry you, ...