daron wyatt was confident he had enough evidence to prove xavier lopez had killed cathy torrez. but once again, the orange county district attorney did not agree. the d.a. decided not to charge? >> correct. >> reporter: and so xavier's set free? >> xavier walks. >> a detective who refuses to quit -- >> i said i have a cold case i need you to take a look at. >> reporter: now has a reason not to. >> my daughter was first born and i remember going to mary shortly after that looking in the eye and yaying "i know. know now how you feel." and not do a burnout? sfx: old fashioned car engines being revved hurry in! buy one, take one is back! tonight en ady breadsticks, salad, and your choice of entre es, like smoked mozzarella chicken. then take home another entre e for tomorrow free. it' s two delicious nights of togetherness . buy one, take one starting at $12.99 at olive garden. get up girl, show me what you can d come on now. shake it, shake babit oohh oohh. shake it, shake it, shake it, oohh. a-b-c, it'easys s 1-2-3 as simple as do-re-me, a-b-c, 1-2-3, baby you and me, yeah. a-b-c,