Nancy Guthrie, 84, was abducted from her Arizona home on Feb. 1.
A second ransom note received by a Tucson, Arizona, television station following the disappearance of Nancy Guthrie said she died shortly after her abduction.
An independent search is underway for Nancy Guthrie's remains near the border following an anonymous tip about the whereabouts of her body, though authorities say there is no evidence to verify the claim.
The FBI was shut out of the Nancy Guthrie investigation for the first four days, FBI Director Kash Patel claimed in a new interview.
The FBI recently received and is now analyzing potentially critical DNA recovered from the Tucson, Arizona, home of Nancy Guthrie.
Savannah Guthrie was back at NBC's "Today" show anchor desk on Monday, marking a return for the first time in more than two months since her mother's disappearance.