tina mora: yes. this this have something to do with that? tina mora: definitely. and his case load shifted to other types of crime. but he never forgot his promise to mary, in part because of a milestone in his own life. detective daron wyatt: 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. and you haven't given up. i won't give up. narrator: in 2003, nine years after the murder, daron once again approached a friend in the da's office. detective daron wyatt: i said i've got a cold case and i need you to take a look at. and he physically stops walking, and he says if it's a case i'm thinking about, i'm not going to touch it. narrator: but daron was persistent. eventually he persuaded his friend to take cathy's case back to the da's homicide unit, the same unit that had rejected it twice before. this time, though, something different happened. a prosecutor unfamiliar with the case agreed to take a fresh look. his name is