FBI Examines Fresh DNA Evidence In Nancy Guthrie Case
Federal investigators are continuing to pursue every available lead in the troubling disappearance of Nancy Guthrie, as new details reveal that key DNA evidence recovered from her home is now undergoing advanced analysis by the Federal Bureau of Investigation.
Sources familiar with the case told Fox News that DNA material—including a hair sample—was collected from Guthrie’s residence in Tucson, Arizona, and submitted to federal authorities for further testing. The move signals an intensified effort to extract actionable intelligence from forensic evidence that has so far failed to identify a suspect.
CeCe Moore, an investigative genetic genealogist with Parabon NanoLabs, explained that a properly processed hair sample is unlikely to be part of a mixed DNA profile.
“Not after it is cleaned for contamination,” she said. “They have that process in good shape, but it can take some time.” She added, “I would assume it would be Nancy plus two or more unknowns.”
Local authorities confirm they are working closely with federal partners. A spokesperson for the Pima County Sheriff’s Department emphasized that cooperation with the FBI has been ongoing since the beginning of the investigation.
“PCSD has worked with the FBI since the beginning of the Guthrie investigation. This is not new information,” the department wrote on X. “The private lab we utilize in Florida continues to share information with the FBI lab & other partner labs across the country. DNA analysis remains ongoing.”
Sheriff Chris Nanos has acknowledged that, despite extensive testing, DNA recovered from the scene has yet to produce a definitive suspect in the February 1 kidnapping of the 84-year-old mother of Savannah Guthrie.
Earlier efforts included submitting evidence to the FBI’s Combined DNA Index System (CODIS), but that search returned no matches. Investigators also identified a partial, mixed DNA sample that was too weak to generate a usable profile—highlighting the technical challenges often associated with complex forensic evidence.
More than 11 weeks into the investigation, authorities say the DNA appears to be a mixture involving three or more individuals. At least one contributor is believed to be male, though no conclusive identification has been made.
Other forensic leads have similarly fallen short. Blood found on the front porch was confirmed to belong to Nancy Guthrie, while a glove discovered roughly two miles from her home—matching one worn by a masked individual captured on a Nest doorbell camera—also failed to yield any matches through federal databases or other collected samples.
As investigators continue their work, the case underscores both the capabilities and limitations of modern forensic science—particularly in complex cases involving degraded or mixed DNA evidence.
Meanwhile, the emotional toll on the family remains profound. Savannah Guthrie spoke candidly about the ordeal during a recent appearance, describing the anguish they continue to endure.
“Someone needs to do the right thing. We are in agony, we are in agony,” she said tearfully in an interview with Hoda Kotb. She went on to call the situation “unbearable.”
“And to think of what she went through. I wake up every night in the middle of the night, every night,” she added. “And in the darkness, I imagine her terror. And it is unthinkable, but those thoughts demand to be thought. And I will not hide my face. But she needs to come home now.”
Authorities and the Guthrie family continue to urge the public to come forward with any information. A reward exceeding $1.2 million remains on the table, including a $1 million offer from the family for information leading to Nancy Guthrie’s recovery.