A prosecutor offers new clues suggesting Elizabeth Thomas did not leave voluntarily with former teacher Tad Cummins. The 15-year-old told her sister “if I’m not back by six o’clock tonight, call the police or come looking for me,” District Attorney Brent Cooper tells Nancy Grace. “My biggest fear is that she had changed her mind about going with Mr. Cummins and that she expressed that to him and he took her then forcefully,” he tells Nancy in this episode.