Three years ago, the disappearance of 10-month-old Lisa Irwin captured the nation's attention.

On "The Kelly File Special: The Baby Lisa Mystery," Megyn took another look at the unsolved disappearance with never-before-seen interviews with Lisa's parents, plus expert analysis.

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On October 3, 2011, Deborah Bradley said she put her daughter to bed. But when the father, Jeremy Irwin, returned home from work at four o’clock in the morning, the baby was gone. The parents maintain that someone broke into their home and grabbed Lisa while she slept.

They believe someone is raising Lisa as their own child and hasn’t harmed her.

As the months passed, the searches eventually stopped and the mystery faded from the spotlight. Until now.

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On "The Kelly File Special: The Baby Lisa Mystery," "human lie detector" Philip Houston, who interviewed Deborah and Jeremy in those secret tapes shortly after Lisa's disappearance, shared his expert insight.

Houston said that prior to those interviews, he assumed there was a high probability that the parents were involved in the disappearance.

In the interviews, however, he did not perceive deceptive behavior in Deborah and Jeremy. In particular, Houston said he noticed the parents did not take extra time to process his questions and they both exhibited a lack of nervous movements.

See some of the never-before-seen interviews and Houston's reaction in the clip above. Watch an in-depth recap of the case and Megyn's exclusive interview with baby Lisa's parents in the clips below.

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