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Problems in the past with boyfriends. >> reporter: then there was the second interview, the day cathy's body was found. detective wyatt studied that tape, too. >> there was one thing that was important that sam didn't display that you would expect to see in a case like this. >> reporter: which is? >> emotion. he showed more emotion over the contents of a coke can. he picked it up when they left the room and reading the coke can and the ingredients and the number of calories. and at one point he puts that down and picks up a baseball hat he had been wearing, sees dirt and brushes it off and sta...

So it's out of sight... ...and out of mind. always discreet. for bladder leaks. i never thought i'd say this, but i found bladder leak underwear that's actually pretty. always discreet boutique. hidden inside is a super absorbent core that quickly turns liquid to gel. so i feel protected... ...and pretty. new always discreet boutique. homicide cop darren wyatt was deep in the cathy torrez murder case. he was looking closely at the behavior and statements from sam lopez. cathy's neighbor and ex-boyfriend. cathy's family said he never stopped by the house while the family was searching for her...

>> she thought about sam's proposal all that week. ultimately, cathy decided, says, tina, she was so broken up about albert, she was going to tell sam the answer was no. >> she's crying and she said i'm going to tell him saturday i will not take off with him and elope. that was wednesday. and then saturday she never came home. >> sam's admitted jealousy, cathy's doting on albert, a rejected proposal, all of it seemed to add up to motive. but motives don't prove murder. there was still no physical evidence tying sam to the crime. all the blood on the car had been tested and it was all cathy's. ...

It's not that big of a deal. it's not horrendous. he doesn't want it to be horrendous because he did it. >> tell number three. and then larry caught something else in the interview sam did before cathy's body was found. listen carefully. >> so you went out with her the saturday before the thursday? >> right. in other words a week before she was -- >> did you hear that. >> the week before she was -- what? dead? murdered? either way, larry thought sam knew more than he was telling. >> the guilty person knows a lot. cannot forget all that he knows. so when he's talking, all that information is in...

Darren wyatt was not going to quit before i filed a case or i died or he died i guess. he was dedicated to this. >> if murphy declined the case a third time, the cathy torrez case would certainly go from cold to dead. what would he decide? no one understood the stakes better than cathy's mom. >> darren had told me that we were going to meet with the d.a. my interpretation of it was he was going to tell me there was nothing they could do. coming up. a key piece of evidence arrives. better late than never. >> how long had they known that? >> a couple of months at least. >> they what, forgot to c...