cathy s older sister was married to sam s older brother. reporter: they had this long on again/off again relationship in which what, he couldn t let go of her or she couldn t let go of him? i think a lot of it was mutual. reporter: even after cathy started dating albert and sam had another girlfriend, too, they continued to see each other. and daron found evidence that in sam s mind, his relationship with cathy was far from casual. mary gave me a shoe box full of letters that were written between sam and cathy, and the content of these letters showed a very jealous guy. a guy who would get angry any time somebody flirted with cathy. reporter: sam didn t try to hide the fact that he was prone to jealousy. she knows, every time she mentions some guy s name, i get pissed off, okay? reporter: that led the detective to take a fresh look at those bizarre events the week before cathy disappeared when she came home impaired and then had her tires slashed. she never regained ful
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cathy had been arguing. but he did say cathy looked fine. nobody was quite sure what happened after that, except they apparently parted company. sam in his car, cathy in hers. then cathy arrived home, too out of it to realize she d been driving on slashed tires. tina saw the tires the next day. i just kept saying, who what happened to your tires? who slashed your tires? reporter: and she d say? and she d say she didn t know. she she just knew that she had gone out with sam that night. reporter: daron wyatt now believed sam drugged cathy, possibly assaulted her, and slashed her tires. the next day, cathy called tina with more details about her strange night with sam. he had told her let s run off, let s get married. let s run off and let s elope. and she told him, you re joking, this is not you know, what are you talking
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about, are you serious? reporter: remember, cathy was seeing another guy. albert. who, only days later tried to kill himself. tina says cathy thought about sam s proposal all that week. ultimately, cathy decided, says tina, that she was so broken up about albert she was going to tell sam the answer was no. she s crying, and then she said, i m going to tell him this saturday that i m not gonna take off with him, that i will not elope. that was wednesday. and then saturday she never came home. reporter: 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. but then, while combing the case file, detective daron wyatt learned something shocking. there were blood and hair samples that had never been sent to the crime lab. and when those samples were analyzed, they pointe