PORTLAND, Ore. -- Parents of missing Portland boy Kyron Horman appealed to viewers of the Oprah Winfrey Show Thursday, more than 13 weeks into his disappearance.

The emotional interview was recorded Wednesday in Chicago and aired Thursday on KGW Newschannel 8

Oprah is in her 25th and last season. She reaches an estimated 21 million viewers a week in the United States and her show is also rebroadcast in 145 countries.

The segment with Kaine and Desiree began with Oprah asking pointed questions about the boy's disappearance as well as the direct involvement that they believe Kaine's estranged wife, Terri Moulton Horman had in what is now a criminal investigation.

More: Sheriff refocusing Kyron investigation

Kaine Horman and Desiree Young used the worldwide clout of Oprah's media empire to appeal to the public to remember Kyron's face through buttons and bracelets, by any means, to buoy chances for his return.

Kaine also characterized when he first suspected something was amiss with his wife Terri Moulton Horman. It was the day she first flunked a polygraph exam.

She would change her story daily, if not more than that, Kaine told Oprah. Every time you talked to her, it was a little bit different about what happened that day.

Kyron disappeared from Skyline Elementary in NW Portland on June 4, sparking the largest search in Oregon's history. No suspects have been named the case although investigators have clearly focused attention on Terri.

Last week marked the boy's eighth birthday. A fundraiser was held for him over the weekend in Wilsonville and raised $1,500.

Late Wednesday, the Multnomah County Sheriff announced that he was shifting to a task force style investigation and that the case continues to progress. He emphasized, they were not scaling back, but instead a team from multiple jurisdictions would be focused on the Kyron case.

Complete coverage: Kyron Horman case

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