winkler at this point. we knew a lot more about how he goes about getting what he wants. >> reporter: the more she learned about cathye it seemed to her that todd must have planned it all. just as the evidence here in california was telling her that the killing of rachel winkler more than a decade later was a case of history, todd winkler's history, repeating itself. but if she had some crusading idea of finding justice in that old case, and using it to solidify her own here in california, she'd have persuade a judge, first. >> announcer: coming up -- >> disorder in the court. >> this is the case about a mastermind. a manipulator, a murderer. >> reporter: when "dateline" continues. ues. oh...i'm scratching like crazy. you've got some allergic itch with skin inflammation. apoquel can work on that itch in as little as 4 hours, whether it's a new or chronic problem. and apoquel's treated over 8 million dogs. nice. and...the talking dog thing? is it bothering you? no...itching like a dog is bothering me. until dogs can speak for themselves, you have to. when allergic itch is a problem, ask for apoquel. apoquel is for the