Family of missing Iowa student shares high school video of her

Nearly three weeks since Mollie Tibbetts disappeared, her father said he believes she's still alive and with someone she knows.
1:18 | 08/07/18

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Transcript for Family of missing Iowa student shares high school video of her
The reward is growing in the search for that missing student in Brooklyn Iowa and this evening we hear from her father his theory. And what police are saying about ABC's Alex Prez on the case again tonight. Nearly three weeks is since Molly tidbits mysteriously disappeared tonight her father saying he believes it is she still alive I do believe. That Molly is with someone. Who she knows probably someone. Who cares about her. But that that relationship was misguided misinterpreted. And went wrong. Police are searching for any Trace of the twenty year old University of Iowa student after she was last seen going for run in Brooklyn Iowa. Tonight Molly's family sharing this video from high school. Molly's father acknowledges his theory is not based on anything he's learned from investigators. He has a message for anyone who might have his daughter. Listen to. Then this. Hearing a little bit of trouble now. Don't make of course. David the reward for information now up to about 300000. Dollars investigators following up on some 500 tips David Alex think you.

This transcript has been automatically generated and may not be 100% accurate.

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