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Report about his demeanor that night? >> you know, initially investigators thought that maybe he wasn't saying everything that happened and -- >> yeah. and he's -- >> you know. >> holding back a little. >> yeah. and maybe he was a little bit nervous. >> but ryan had an alibi, right? he was at work when sandra was killed. well, ponce found out the estimated time of sandra's death was really more of a rough guess. and that sandra could just as well have been murdered hours earlier, when ryan wasn't at work. and then there were the results from ryan's 2006 polygraph exam. what was the result of t...

Verdant estates of the wealthy few. she was in a neighborhood more working class suburbia than polynesian paradise. in her own small ranch house, in her garage, in her car. she'd been strangled to death. it was sandra's new boyfriend, ryan shinjo, who called the police, said he found her that way. >> and she was slumped to the right, to the passenger seat, face down into the seat. >> roy asher was one of the original investigators. we spoke to him in 2009. this was three years after sandra was murdered. >> i saw the back of her neck, some ligature marks. we didn't find the cord itself. we have...

A recent transplant from oahu, named ryan shinjo. >> so he wined and dined her and, you know, took really good care of her and he was -- i mean, he was really nice to her. and they were always, you know, doing all kinds of fabulous things. >> going on honolulu shopping trips, for instance, where ryan would lavish expensive gifts on sandra, like luis vuitton luggage. larry and sandra's mom, toshie, knew little of this relationship, and on january 25th, 2006, were in dallas visiting their son when they got an odd call from sandra's boss. >> he said that she hadn't showed up for work, very unusua...

>> you know, it was still dark. >> ponce also found this email sandra sent her lawyer just three weeks before her murder. >> darren started asking me about my boyfriend, as he calls him, ryan. he got really upset and started swearing at me. he started shaking me telling me to tell him the truth and don't ever call him again. >> ponce worked the investigation for close to a year. and as he weighed and reweighed the evidence, he always came back to darren. who lacked an alibi. who called in sick to work. who gave conflicting accounts about the morning the of the murder. who left blank the diary ...

Saw sandra's car return a short while later, but without the children. larry learned through his contacts that sandra had a 10:00 appointment that morning to get her nails done at a salon about 45 minutes away. >> she never made the appointment. so this is how we narrowed down the time of death. before about 9:00, where she would have had to leave to make her appointment. >> the cops didn't tell him, but larry learned from his own sources that boyfriend ryan had an alibi, while husband darren did not. all of which got larry thinking the same thing as the police. must have been darren who murde...