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That sometimes you need the help of one of the people involved to get the main person. >> reporter: and so dawn oxley was offered a limited immunity agreement, cooperate with the prosecution, testify truthfully against james and you won't be prosecuted. a sort of get out of jail free card. why go ahead and make that deal with her so soon? you had her statement. why not hold off for a while and be patient and then get them both? >> let's say we don't do the deal with her and we go out and arrest him. what's our evidence? >> reporter: dawn signed the agreement and james matlean was charged with ...

Ben. >> the night ben died he said now or never. i said no. not today. don't do it. no. i said no. no, no, no, no, no. >> hours later, she said, james woke her up from a sound sleep and told her ben was dead. that, she said, is all he told her. all she knew. >> you confident james had something do with it? >> i don't know. >> is that really all she knew? dawn, remember, had a 16-year-old son named devin, who, detectives learned, was at home and listening in the hours before ben oxley was murdered. if anyone could confirm dawn's version of the events, it would be devin, but he was not talking. ...

We don't have food in the house, can you bring us food? there is a problem. >> when dawn and ben went to court to fight for custody, cindy had to tell the truth. >> told the judge that dawn wasn't taking care of her kids anymore. they were not a priority. they were not even number five. >> when ben won custody of alyssa and more than $200 a month in child support, dawn was devastated. this is her mother, a retired deputy sheriff. >> she would sit in the garage and just bawl about not getting her day in court. >> this was eating her alive. >> it was really taking its toll on her. >> dawn starte...

Testify truthfully against james and you won't be prosecuted. a sort of get out of jail free card. >> why go ahead and make that deal with her so soon? you had her statement. why not hold off and be patient and get them both? >> say we don't do the deal with her and arrest him. what's our evidence? >> dawn signed the agreement and james was charged with first-degree murder. but, the end of the story? oh, no. not even close. the truth had been hiding, but it was itching to come out. young devin, remember him? dawn's son? devin decided it was time to reveal what he overheard the night of the mur...

>> reporter: and so dawn oxley was offered a limited immunity agreement, cooperate with the prosecution, testify truthfully against james and you won't be prosecuted. a sort of get-out-of-jail-free card. why make that deal with her so soon? you had her statement. why not hold off for a while and be patient and then get them both? >> let's say we don't do the deal with her and we go out and arrest him. what's our evidence? >> reporter: dawn signed the agreement and james was charged with first-degree murder. but the end of the story, oh, no, not even close. the truth had been hiding, but it was...