Jennifer and Bart Corbin had a seemingly perfect life. Bart's successful dental practice afforded the couple a beautiful home in the Atlanta suburbs where they raised their two little boys. But one December morning in 2004, seven-year-old Dalton Corbin woke up to a living nightmare. He ran to his neighbor's house in his pajamas and told them his mother was dead. Correspondent Peter Van Sant examines how a suburban mom suffered a fatal gunshot wound to the head and investigates her husband, a man who may have had something deadly to hide from his apparent charmed past. Van Sant also speaks exclusively to Jennifer's online lover - a person concealing a double identity.