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Matter of at least a couple of days, trying to get him to contact her because he's so close to cathy and she's missing. >> reporter: montgomery noted a key detail about those pages. mary's home phone and cathy's home phone are the same number. >> they're the same numbers. >> reporter: so, seeing that number on his pager, how did sam know it wasn't cathy? >> if he knew she was alive, he would know he got 20 or 25 pages from cathy, or at least think that. if he's guilty and he killed cathy, he knows those 20 or 25 pages were not from cathy. >> reporter: that was tell number two. then montgomery ...

Sam's claim that cathy never tried to contact him after she disappeared. >> i thought she was going to page me on friday. she goes somewhere, and she never paged me on friday. >> we know that cathy's mom paged him 20 or 25 times in a matter of at least a couple of days, trying to get him to contact her because he's so close to cathy and she's missing. >> reporter: montgomery noted a key detail about those pages. mary's home phone and cathy's home phone are the same number. >> they're the same numbers. >> reporter: so, seeing that number on his pager, how did sam know it wasn't cathy? >> if he ...

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 people hit me up already. they said that -- that -- that we were supposed to elope, okay? this is what she -- okay, but look. she had a crazy idea to go to mexico, okay? just the two of us. >> reporter: then there was sam's claim that cathy never tried to contact him after she disappeared. >> i thought she was going to page me on friday. she goes somewhere, and she never paged me on friday. >...

>> reporter: then there was sam's claim that cathy never tried to contact him after she disappeared. >> i thought she was going to page me on friday. she goes somewhere, and she never paged me on friday. >> we know that cathy's mom paged him 20 or 25 times in a matter of at least a couple of days, trying to get him to contact her because he's so close to cathy and she's missing. >> reporter: montgomery noted a key detail about those pages. mary's home phone and cathy's home phone are the same number. >> they're the same numbers. >> reporter: so, seeing that number on his pager, how did sam kno...

>> i thought she was going to page me on friday. she goes somewhere, and she never paged me on friday. >> we know that cathy's mom paged him 20 or 25 times in a matter of at least a couple of days, trying to get him to contact her because he's so close to cathy and she's missing. >> reporter: montgomery noted a key detail about those pages. mary's home phone and cathy's home phone are the same number. >> they're the same numbers. >> reporter: so, seeing that number on his pager, how did sam know it wasn't cathy? >> if he knew she was alive, he would know he got 20 or 25 pages from cathy, or at...