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>> darren wyatt was promoted to detective sergeant 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. >> 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 t i can feel it myself. i'm a dad now. and you haven't given up. i won't give up. >> in 2003, nine years after the murder, darren once again approached a friend in the d.a.'s office. >> i said i've got a cold casey need you to take a look at. he physic...

Name sam? >> yeah, absolutely. >> now you really are back to square one? >> yes. >> is that the end? >> to some people. >> but not to him. and not to mary. you put a lot of faith in darren. >> i put a lot of faith in god. darren was his tool. >> but for the time being, it seemed darren's hands were tied. after all, the case had been rejected by the d.a.'s office twice before. >> this case got a lot of baggage over the years. >> yes, it did. >> if you go ahead with it, you're not only going ahead with the case, you're also kind of insulting the d.a. >> yeah. >> years went by. the cathy torrez c...

2007, 15 years after cathy torrez had breathed her last. >> i was having coffee. it was before work and i was reading my bible. it was a little bit after 7:00 when i saw that i had a call from him. >> from darren wyatt. mary knew he was scheduled to meet with the d.a. >> my first thought was he was going to tell me that the meeting was canceled again. >> but that was not the message. not at all. >> he said i'm standing here in front of sam's house and we are making an arrest right now. >> and you thought? >> i got up and i think i screamed there at the mcdonald's. >> years before, darren wyatt...

He wasn't alone the night he stabbed cathy to death. sam's cousin javier was also arrested and charged with murder. police also arrested sam's older brother armando who was once married to cathy's sister tina and had helped search for cathy. >> it's just a tragic loss. it hurts. everybody loved cathy. >> armando was charged with being an accessory after the fact for allegedly helping cover up the murder. >> we believe he was telling people who had information that could help convict sam not to cooperate with the police. >> cathy's sister had to ponder what that might mean about her former husb...

Dated in high school. cathy's older sister was married to sam's older brother. >> they had a 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. >> even after cathy started dating albert and sam had another girlfriend, too, they continued to see each other. and darren found evidence that in sam's mind, his relationship with cathy was far from casual. >> mary gave me a shoebox full of letters written between sam and cathy and the content of these letters showed a very jealous guy, a guy who would get an...