On Dec. 3, 1957, 7-year-old Maria Ridulph disappeared near her Illinois home, and five months later, her body was found. The case went cold for 55 years, until a mother’s deathbed confession implicated her own son, Jack McCullough — once known as John Tessier — who eventually was convicted of the murder, despite maintaining his innocence. Dr. Phil sits down with Maria’s brother, Chuck, and talks to Maria’s friend Kathy — the last person to see her alive. What happened that fateful night? Plus, hear from McCullough’s sister, Janet, who turned her brother in and testified against him. Why does she say she’s convinced her brother is guilty? And, learn why McCullough’s stepdaughter, Janey, says her stepfather is not a murderer. Could McCullough have been wrongfully convicted?

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Hear from Chuck and Kathy — what happened the day Maria disappeared?

Why does Janet say she's convinced her brother is guilty of murdering Maria?

Janet and Janey meet for the first time. Why does Janey say her stepfather is not a murderer

Dr. Phil analyzes McCullough's prison interview. Could he have been wrongfully convicted?

Tune in to hear from investigators in the case, including a prosecutor who says McCullough gave him the "creeps." Plus, McCullough's girlfriend at the time of Maria's disappearance speaks out — does she believe he's guilty of murder?

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