Dr. Phil continues his exclusive jailhouse interview with 21-year-old Erin Caffey, who is serving two life sentences plus 25 years in prison for her part in the murders of her mother and two younger brothers, and attempted murder of her father, in 2008. Speaking publicly for the first time, Erin denies that she was the mastermind who plotted to kill her family -- but admits she knew about it and didn’t stop it. Dr. Phil asks what everyone wants to know -- why? Erin has told three different stories to authorities, a counselor, and her father about what happened that night -- can Dr. Phil get to the truth? And, hear Erin’s account of how she felt when she learned her father survived. Plus, hear Erin’s heartfelt letter to her father, written four months into her incarceration -- and Dr. Phil’s thoughts on the letter. Terry says he’s forgiven his daughter -- but is he in denial about her role in the massacre? And, did Erin want her family dead long before dating Charlie? Erin’s ex-boyfrien