Seven-year-old Kyron Horman vanished without a trace after his school science fair nine years ago. His parents, Kane and Desiree, say they believe Kyron’s stepmother, Terri, knows what happened to him, but Terri denies having any knowledge of Kyron’s whereabouts.

In episode 4 of “Into Thin Air: The Mysterious Disappearance of Kyron Horman,” Dr. Phil reviews grand jury official testimonies, and explores new revelations into the ground search efforts for Kyron in the days and weeks after he disappeared. Plus, did lawsuits filed by both Kane and Desiree ultimately change the direction of the investigation into their son’s disappearance?

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