The FBI is now heavily involved in the investigation into the disappearance of Nancy Guthrie, the mother of "Today" show host Savannah Guthrie. As the family makes another plea for her return, Jan Carabeo breaks down the latest timeline of known events connected to the missing Arizona woman.

The search for “Today” show host Savannah Guthrie’s mother still had no suspect or person of interest Wednesday, authorities said, four days after she disappeared with signs of forced entry at her hom...

Pima County officials said there are still no suspects, and Guthrie's health is in imminent danger after going several days without vital medicine.