Nancy Guthrie remains to be found and a former FBI agent has shared expert insights into what might give the kidnapper away to those around them.

The 84-year-old's whereabouts remain unknown more than three months after authorities believe she was taken from her Tucson, Ariz., home against her will

A friend of Nancy Guthrie has spoken out for the first time in weeks as reports claim others were asked to stay silent.

Pima County supervisors take action on Sheriff Chris Nanos' fate after allegations he committed perjury during the high-profile Nancy Guthrie case.

One hundred days after Nancy Guthrie disappeared from her Arizona home, investigators say that they believe the case will eventually lead to an arrest as forensic testing and the analysis of digital evidence continues.

The "Today" show anchor's 84-year-old mom, Nancy Guthrie, was first reported missing from her Tucson, Arizona, home on Feb. 1.

A strand of DNA. An eerie doorbell video. The investigation into Nancy Guthrie's disappearance reaches 100th day with no sign of a breakthrough.

A retired Pima County lieutenant reveals how Tucson's desert washes could serve as escape routes in the kidnapping of Nancy Guthrie, age 84.