that's one thing to talk somebody into murdering somebody for you. but then to talk that same person into killing themselves if they got caught, how do you do that? >> reporter: christine white did not attend the trial. she declined our request for an interview, but wrote us a letter saying she had don had no custody battle in december 2016, only different ideas in school choices, tuition. regarding don's murder, she wrote -- >> reporter: prosecutors natalie and david say the investigation into christine is still open. but they don't know when, or if she might be charged. >> we would have to be able to prove beyond a reasonable doubt that she intended all along for terry white to do this, and more than that, that she did something concrete to aid and