Authorities are now offering over $200,000 for help finding Nancy Guthrie after an anonymous $100,000 donation

Pima County deputy sheriffs in the driveway of Nancy Guthrie's residence, where she was last seen when her family dropped her home after a dinner.

Joe Raedle/Getty Images

• Authorities received a $100,000 donation to use as a reward to aid in the search for Nancy Guthrie.
• Alongside the FBI's $100,000 reward, the total now exceeds $200,000.
• Guthrie, the mother of "Today" show host Savannah, has been missing since February 1.

An anonymous donor has given $100,000...