The psychiatrist whose testimony helped convict Andrea Yates in the slayings of three of her children -- and was the basis for an appeals court's decision to overturn the convictions -- says he made a mistake, but still believes the Texas mother was sane when she killed her children. "I don't think there's any question about that [Yates' sanity]," Dietz said in an interview on "Good Morning America" today. "The evidence that she knew right from wrong is what she said. She says in recorded statements, including my interviews, that as she killed her children, she knew that it was...