Despite an intense search involving thousands of law enforcement officers, there has been no sign of Nancy Guthrie since she went missing on Feb. 1

Savannah Guthrie returned to hosting the "Today" show on Monday for the first time since her mother disappeared from her Arizona home more than two months ago.

There has been no sign of the 84-year-old mother of three since she was reported missing Feb. 1. Here's a timeline of events.