In 2010, Tommy’s 19-month-old son, Darby, and 4-year-old stepdaughter, Kiera, mysteriously died three months apart — and he says he believes his ex-wife, Julia, and her new husband, Codey, killed them. Although Julia and Codey vehemently deny any wrongdoing, they say Tommy and his mother, Cheryl, have engaged in a massive crusade online and in the media, labeling them as “baby killers.” The couple face their accusers on Dr. Phil’s stage. How do Julia and Codey explain what happened to Darby and Kiera? Don’t miss part two tomorrow, when forensic pathologist Dr. Cyril Wecht reviews the children’s autopsies — what does he conclude? And, will Julia and Codey agree to take polygraph tests?