MSNBC Dateline October 7, 2019 06:43:00
Me. when he did, it just seemed like it was kind of for show, you know. if -- when people were around he'd behave a certain way, and when those people left he would go back to his -- his ill temperedness and his kind of monstrous ways. >> reporter: to help explain how derek had crystal killed, prosecutors again called her sister michelle who had been through the emotional wringer when she testified in the first trial. >> do you solemnly state that the testimony -- >> i was afraid of what it was going to do to me mentally the second time. i was afraid for myself. >> reporter: nevertheless, mich...