the cathy torrez case grew colder by the day. between cathy's sister tina and sam's brother armando. you and armando got divorced. >> yes. >> reporter: this have something to do with that? >> no. definitely it was all intermixed. >> reporter: daron wyatt was promoted to detective sergeant and his caseload shifted to other types of crime. but he never forgot his promise to mary. in part because of a milestone in his own life. >> my first daughter was born. and i remember going to mary shortly after that and looking her in the eye and saying, "i know -- i know now how you feel. i know it. i can feel it myself. i'm a dad now. you haven't given up. i won't give up." >> reporter: in 2003, nine years after the murder, daron once again approached a friend in the d.a.'s office. >> i said, "i've got a cold case that i need you to take a look at." and he physically stops walking and he says, "if it's the case i'm thinking about, i'm not gonna touch it. >> reporter: but daron was persistent. eventually he persuaded his friend to take cathy'