Walmart surveillance becomes key evidence in Nancy Guthrie disappearance as investigators use retail data to narrow suspects, says expert Jason Pack.

An ex-FBI agent is questioning whether Savannah Guthrie and her family members quietly paid the ransom for their missing mother, Nancy, RadarOnline.com can reveal. Jason Pack, a retired FBI hostage negotiator, spoke out in an interview with Fox News to share his insights.

Retired FBI agent Jason Pack said that the bureau’s Cellular Analysis Survey Team (CAST) is among the most valuable tools in missing-person investigations.

The search for Nancy Guthrie, mother of "Today" show host Savannah Guthrie, is entering its third week on Monday as the FBI works to analyze DNA found in a glove near Nancy Guthrie's home.

FBI video forensics experts brought specialized equipment to missing Arizona woman Nancy Guthrie's home as an intensive search operation enters its 12th day.

Both the Pima County Sheriff's Department and the FBI are investigating the disappearance of Nancy Guthrie, with rumors circulating that the two agencies are not working well together. Jason Pack, a former FBI supervisory agent,

Retired FBI supervisory special agent Jason Pack analyzes the emotional video plea from Nancy Guthrie's family, including Savannah Guthrie, and the latest on the investigation to find her.

As the search continues for Savannah Guthrie’s missing mother, Nancy Guthrie, all eyes are on the case — and many people are wondering why a white tent was placed outside the 84-year-old’s home.

The FBI described the suspect in Nancy Guthrie’s abduction as a 5-foot-9-inch man of average build who was wearing a black “Ozark Trail Hiker Pack” backpack.