It's been seven years since Dr. Phil sat on the Oprah Show stage. In that time, he's delivered hundreds of smackdowns on The Dr. Phil Show and heard plenty of harrowing stories. But it was Melissa Moore, a guest with a dark family secret, who revealed a truth he felt compelled to share.

Dr. Phil met Melissa in 2008 at one of his "Get Real Retreats," an intense three-day therapy session. Melissa went on the retreat, she says, to decide if she should try to have a relationship with her estranged father. During their sessions, Melissa told Dr. Phil she didn't know why she was protecting a man who had hurt her. When Dr. Phil asked what Melissa's father had done, she admitted a shocking secret: He was a serial killer.


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