cathy torrez. reporter: it was a shot in the dark. a tactic he d picked up at a seminar for cultivating informants. and the patrol officer that is next to me starts kind of kicking my foot. and he s got an explorer scout who s riding with him a young hispanic female. and i look at her name tag and it was d. torrez. turned out it was debbie torrez, cathy s youngest sister. reporter: who just heard you ask that question. correct. reporter: you had no idea it was her? i had no idea. reporter: debbie torrez cathy s baby sister was now 14 years old. eager, her mom says, to assist police because of everything her family had been through. she remembered that when we needed help, people came to help us. so she thought it was her turn to help others. reporter: which is why debbie was in the park that afternoon, and how she heard daron mention cathy s case. that is a weird coincidence. we don t believe in coincidences.
okay, so tell me who killed cathy torrez. reporter: it was a shot in the dark. a tactic he d picked up at a seminar for cultivating informants. and the patrol officer that is next to me starts kind of kicking my foot. and he s got an explorer scout who s riding with him a young hispanic female. and i look at her name tag and it was d. torrez. turned out it was debbie torrez, cathy s youngest sister. reporter: who just heard you ask that question. correct. reporter: you had no idea it was her? i had no idea. reporter: debbie torrez cathy s baby sister was now 14 years old. eager, her mom says, to assist police because of everything her family had been through. she remembered that when we needed help, people came to help us. so she thought it was her turn to help others. reporter: which is why debbie was in the park that afternoon, and how she heard daron mention
so, you know, just almost as a flippant remark, i tell him, okay, so tell me who killed cathy torrez. reporter: it was a shot in the dark. a tactic he d picked up at a seminar for cultivating informants. and the patrol officer that is next to me starts kind of kicking my foot. and he s got an explorer scout who s riding with him a young hispanic female. and i look at her name tag and it was d. torrez. turned out it was debbie torrez, cathy s youngest sister. reporter: who just heard you ask that question. correct. reporter: you had no idea it was her? i had no idea. reporter: debbie torrez cathy s ba siste was now 14 years old. eager, her mom says, to assist police because of evything her mily had been through. she remembered that when we needed help, people came to help us. so she thought it was her turn to help others. reporter: which is why debbie was in the park that afternoon, and how she heard daron mention cathy s case.
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 starts swearing about the fact that there s dirt on his hat. oh [ bleep ]. but he never shows any emotion about the fact that this gal has been brutally murdered, no emotion whatsoever. reporter: and that s a big red flag? huge. reporter: daron went deeper into sam and cathy s relationship. there were a lot of things that brought them together, they were in high school, lived across the stree
and the patrol officer that is next to me starts kind of kicking my foot. and he s got an explorer scout who s riding with him a young hispanic female. and i look at her name tag and it was d. torrez. turned out it was debbie torrez, cathy s youngest sister. reporter: who just heard you ask that question. correct. reporter: you had no idea it was her? i had no idea. reporter: debbie torrez cathy s baby sister was now 14 years old. eager, her mom says, to assist police because of everything her family had been through. she remembered that when we needed help, people came to help us. so she thought it was her turn to help others. reporter: which is why debbie was in the park that afternoon, and how she heard daron mention cathy s case. that is a weird coincidence. we don t believe in coincidences. reporter: to daron wyatt, it felt more like fate. and just months later, in