The family of missing Iowa college student Mollie Tibbetts hasn't really wavered on its position that they believe the 20-year-old is alive. On Tuesday, father Robert Tibbetts shared his theory on what may have happened with CBS News: He thinks Tibbetts may know whomever she's with. "I think someone went to the house that Mollie knew or that Mollie trusted and that she left with them willingly. Now they're in over their head and they don't know what to do." He made similar comments to ABC News: "It's totally speculation, but I do believe that Mollie is with someone who she knows, probably someone who cares about her. But that relationship was misguided, misinterpreted, and went wrong." More on the case:
- CBS News offers one other touching detail about Robert's close relationship with his daughter: Tibbetts served as his best man when he married earlier this year.