Investigators pursuing the abduction of Nancy Guthrie from her Tucson home face a stubborn forensic puzzle, DNA recovered from the crime scene belongs to four or more people, and months of lab work have yet to produce a suspect.
The Pima County Sheriff's Department confirmed that its investigators are "currently looking into additional investigative genetic genealogy options for DNA evidence to check for matches," a step that acknowledges the limits of traditional database searches in a case that has drawn national attention since Guthrie, the mother of NBC anchor Savannah Guthrie, vanished on January 31. A glove found roughly two miles from the property yielded DNA that did not match any profile in CODIS, the federal database of convicted and arrested offenders, and did not match DNA found at the home itself. That glove lead went nowhere; News Nation reported the glove DNA traced back to someone unconnected to the case.
The dead end left investigators with the scene DNA, and that sample carries its own problems. Sheriff Chris Nanos told Fox News in late July that a hair recovered from Guthrie's home produced no usable DNA at all. "It came back... there's no DNA," Nanos said, adding that the hair could still matter once a suspect is identified. "You don't just destroy it." The broader DNA collected from the property, meanwhile, is a complex mixture containing genetic material from more than one contributor, and possibly four or more.
Four-person DNA mixture narrows the path forward
Cece Moore, a genetic genealogist who appeared on Elizabeth Vargas Reports, called the mixture disappointing but not surprising. Complex crime-scene samples routinely contain material from multiple people, she said. But the sheer number of contributors raises the difficulty.
Moore told Newsmax that if the unknown DNA represents only a small fraction of the total mixture, say, ten percent, it may not yield enough genetic markers for identification. She also noted that the ancestry of the unknown contributor matters: a suspect with deep American roots and European ancestry could be matched in hours through genealogical databases, while other backgrounds might take far longer because fewer relatives have submitted consumer DNA tests.
Moore put the challenge bluntly on the Vargas program:
"As far as the mixture, well, we knew it was a complex mixture. We knew it was more than two people. It is disappointing to hear that it's four or more people with the latest interviews that the sheriff has given, because that is going to make it extremely difficult."
Nanos himself acknowledged the difficulty. He told reporters that the lab handling the evidence has flagged "challenges" with the sample, challenges that could take weeks, months, or up to a year to resolve. That is a long timeline for a family still waiting for answers and a sheriff's department that has staked its credibility on the forensic evidence.
FBI and a private Florida lab split the forensic workload
The investigation's forensic pipeline runs through two labs. The Pima County Sheriff's Department sent DNA evidence to an unnamed private lab in Florida, which has been sharing results with the FBI laboratory and other partner labs across the country. The FBI has worked the case since the beginning, the sheriff's department said in a statement issued around April.
But a separate FBI statement, reported by ABC News, suggested friction over the pace of that cooperation. An FBI official said the bureau had requested the DNA material "over two months ago" and that the private Florida lab took eleven weeks to transfer the original hair sample to the FBI Laboratory for testing. The official added flatly: "There is no new DNA evidence in the Nancy Guthrie case."
That timeline raises a fair question. If the FBI asked for the material months earlier and waited nearly three months to receive a single hair sample, how much time has been lost, and who is responsible for the delay? The sheriff's department has maintained that coordination is ongoing and routine. The FBI's statement reads differently. Eleven weeks is not routine.
A hair sample that ultimately yielded no DNA spent weeks in transit between labs while a kidnapping victim remained missing. That kind of bureaucratic lag deserves scrutiny, not reassurance.
Genetic genealogy cracked the Kohberger case in 48 hours
Genetic genealogy, the technique investigators are now pursuing, works differently from a standard CODIS search. Instead of looking for an exact match against a database of known offenders, analysts upload a DNA profile to open-source genealogical databases such as GEDmatch or FamilyTreeDNA and look for partial matches with distant relatives. Even a fourth or fifth cousin can provide enough of a lead to build a family tree, narrow the pool by age and geography, and identify a plausible suspect. Investigators then obtain the suspect's DNA through a warrant or an abandoned sample, a coffee cup, a discarded tissue, and compare it to the crime-scene evidence.
The method is not theoretical. It identified the Golden State Killer after decades of dead ends. And it identified Bryan Kohberger as the suspect in the 2022 murders of four University of Idaho students, a man who had no prior criminal record and no profile in CODIS. An Othram spokesperson told Fox News that the Kohberger identification took just 48 hours once the DNA profile was built.
David Mittelman, CEO of Othram, the forensic genomics company that assisted in the Kohberger case, said a CODIS miss does not render DNA useless. Mittelman told the New York Post that forensic genome sequencing can build a detailed profile to search genealogical databases and find distant relatives even when the suspect has no criminal record. But he stressed that speed matters in an active abduction case.
"A lack of a CODIS hit does not mean the DNA isn't useful. It simply means the person is not in that database. CODIS is just one of many forensic tools."
Ruth Ballard, a forensic geneticist, echoed that assessment, telling the Associated Press that if the sample quality is good and analysts can extract a clean profile, "they could find a hit on that fairly quickly." But Barbara Rae-Venter, an expert genealogist, offered a more cautious view: "I've solved cases in less than eight hours where people shared a lot of DNA with the suspect. Other cases, you're still working on them two years later."
Arizona law gives investigators an additional tool. State authorities can revise CODIS searches to look for relatives of suspects, a familial search capability, and then apply genetic genealogy analysis, according to NPR. That option, combined with consumer databases, gives the Pima County team more than one avenue to pursue.
Guthrie family's $1 million reward underscores the stakes
The Guthrie family has offered a $1 million reward for information leading to Nancy Guthrie's recovery, a measure of both their resources and their desperation. Savannah Guthrie addressed the public directly, acknowledging the possibility that her mother may not be found alive.
"We also know that she may be lost. She may already be gone. If this is what is to be, we will accept it. But we need to know where she is. We need her to come home."
That plea landed months ago. The investigation has continued, but the public record shows more process than progress. DNA from the glove led to a dead end. The hair sample produced no genetic material. The scene DNA is tangled with contributions from at least four people. The FBI says there is no new evidence. The sheriff says the labs are working through challenges.
A forensic psychologist has publicly questioned other aspects of the case, including ransom notes, adding another layer of uncertainty to an investigation that has created more questions than answers.
News Nation reported in August that genetic genealogy work is underway and has produced some matches, but every person matched so far has been cleared as a suspect. The complexity of the recovered DNA has stretched the analysis timeline well beyond what investigators initially hoped.
Meanwhile, a man previously detained in the case has demanded that Pima County unseal the warrant used to search his home, a reminder that the investigation has touched lives beyond the Guthrie family without producing charges against anyone.
Proven science, but no guarantee on a contaminated sample
Genetic genealogy has earned its reputation. The technique has cracked cold cases that sat unsolved for decades, connecting crime-scene evidence to suspects who never appeared in any law-enforcement database. When the DNA is clean and the suspect has American relatives who submitted consumer tests, the process can move fast.
But the Guthrie case does not offer clean DNA. It offers a mixture from four or more contributors collected from a home where family members and workers left their own genetic traces. Separating the unknown contributor's profile from that noise is the central technical challenge, and no expert quoted in the case has promised it can be done quickly, or at all.
Sheriff Nanos has declined to say how many DNA samples his department is currently testing. The private Florida lab remains unnamed. The FBI's pointed statement about waiting eleven weeks for a single hair transfer suggests the inter-agency coordination is not as seamless as the sheriff's office has portrayed.
None of this means the case is cold. Genetic genealogy remains the strongest available tool, and the Pima County Sheriff's Department says it is pursuing every option. But months into the forensic effort, the public record shows an investigation still waiting for science to deliver what traditional police work has not.
A family offered a million dollars for answers. Taxpayers funded two labs and an FBI partnership. The least the public deserves is a clear accounting of why, this far in, the forensic pipeline is still producing process updates instead of suspects.
