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Taking a while so i got out. >> reporter: then more specific. >> about 15 minutes, 20 minutes. >> reporter: later another revision -- >> maybe about five minutes. >> reporter: and, detectives were perplexed by what sandra claimed she did and did not hear that night -- >> hear anybody scream? >> no. >> hear the dogs? oh, you hear the dogs barking? >> yeah because they were outside our window. >> reporter: but, after almost two hours in, as investigators pushed her, sandra seemed to tweak this key element of her story -- >> actually i don't even remember hearing the dogs. my husband's the one th...

Claimed she did and did not hear that night -- >> hear anybody scream? >> no. >> hear the dogs? oh, you hear the dogs barking? >> yeah because they were outside our window. >> reporter: but, after almost two hours in, as investigators pushed her, sandra seemed to tweak this key element of her story -- >> actually i don't even remember hearing the dogs. my husband's the one that says he's got better hearing than i -- >> reporter: of course, the change-ups in sandra's story could be attributed to shock. but, as the detectives viewed it, sandra was being deliberately evasive. enhancing her story ...

Claimed she did and did not hear that night -- >> hear anybody scream? >> no. >> hear the dogs? oh, you hear the dogs barking? >> yeah because they were outside our window. >> reporter: but, after almost two hours in, as investigators pushed her, sandra seemed to tweak this key element of her story -- >> actually i don't even remember hearing the dogs. my husband's the one that says he's got better hearing than i -- >> reporter: of course, the change-ups in sandra's story could be attributed to shock. but, as the detectives viewed it, sandra was being deliberately evasive. enhancing her story ...

>> my memory is so bad. >> reporter: it seemed implausible to them that sandra really heard nothing the entire night. >> this is happening in a very small space? the husband is stabbed to death and found in one closet. and she's been tied up in another? >> that's right. >> reporter: the investigators closely studied that interview they'd conducted with sandra. they found her more indifferent than distraught. >> do you know what has happened today? >> my husband was murdered. >> how? >> i don't know. >> reporter: and when sandra broke down crying, the detectives couldn't recall seeing any tears...

>> maybe about five minutes. >> reporter: and, detectives were perplexed by what sandra claimed she did and did not hear that night -- >> hear anybody scream? >> no. >> hear the dogs? oh, you hear the dogs barking? >> yeah because they were outside our window. >> reporter: but, after almost two hours in, as investigators pushed her, sandra seemed to tweak this key element of her story -- >> actually i don't even remember hearing the dogs. my husband's the one that says he's got better hearing than i -- >> reporter: of course, the change-ups in sandra's story could be attributed to shock. but, ...