CBS News is learning new details in the mysterious case of a missing mother in Colorado. Kelsey Berreth disappeared more than two months ago. Her fiancé, Patrick Frazee, is charged with murder. Now Krystal Lee, an Idaho nurse, is at the center of a cover-up investigation. She pleaded guilty Friday to tampering with evidence in the case. Nikki Battiste spoke to Lee's close friend and confidante, who shares why she believes Lee admitted to helping Frazee.

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