Play Audio Clip Listen to audio clip.

Play Audio Clip Listen to audio clip.

Play Audio Clip Listen to audio clip.

Mollie Tibbetts' father, Rob Tibbetts, sat down and spoke with FOX News Investigates' Cristina Corbin about the latest information on the disappearance of his daughter Mollie Tibbetts.

Fitbit information is crucial:

Who saw Mollie last?