The 84-year-old mother of "Today" host Savannah Guthrie is believed to have been taken against her will from her Tucson, Ariz., home in the early morning hours of Feb. 1 Don Arnold/WireImage; FBI Phoenix/X Federal investigators are using new technology to ...

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

In this May 4, 2015, file photo, Australian-born presenter, Savannah Guthrie poses alongside her mother Nancy Guthrie during a production break while hosting NBC’s ‘Today Show’ live from Australia at Sydney Opera House in Sydney. (Don Arnold ...

A top FBI official is clarifying reports regarding critical new DNA information being found at Nancy Guthrie's home in Tuscon, Ariz. "This is not new evidence or information. FBI asked to test this DNA 2 months ago with the same technology we’ve always ...

After initial tests produced “mixed” results, investigators are turning to the FBI’s elab to analyze new samples that could finally solve the Guthrie case. Sources close to the investigation have confirmed to NewsNation that the FBI’s lab has ...

TUCSON, Arizona — The FBI is analyzing what authorities describe as potentially critical DNA evidence in the ongoing investigation into the disappearance of 84-year-old Nancy Guthrie, a case that has drawn national attention. The new round of testing ...

The FBI recently received and is now analyzing potentially critical DNA recovered months ago from the Tucson, Arizona, home of Nancy Guthrie, sources familiar with the investigation told ABC News. Nancy Guthrie, the 84-year-old mother of "Today" show host Savannah Guthrie, was abducted from her home early on Feb. 1.

Blood spatter evidence shows Nancy Guthrie made a last stand on her porch before being abducted, and the suspect made key mistakes, retired FBI agent says.