Hair DNA emerges as key clue in Nancy Guthrie case, no suspect after 11 weeks

TUCSON, ARIZONA: Investigators probing the disappearance of Nancy Guthrie have recovered additional DNA evidence from her home, including a hair sample that has been submitted for advanced analysis by the Federal Bureau of Investigation, according to Fox News Digital.

More than 11 weeks after the 84-year-old vanished on February 1, authorities are continuing to examine complex forensic evidence, with officials saying multiple samples have yet to produce a clear suspect. The case remains unsolved as investigators work across agencies to piece together what happened.

DNA evidence under review

Sources familiar with the investigation told Fox News Digital that DNA, including a hair sample, was collected from Guthrie’s home in Tucson and shared with the FBI for further testing. The evidence is expected to undergo more advanced forensic examination.

A spokesperson for the Pima County Sheriff's Department confirmed that the agency has been collaborating with federal authorities since the early stages 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."

Hair sample insights

CeCe Moore, a leading investigative genetic genealogist at Parabon Nanolabs, weighed in on the significance of the hair sample, suggesting it may not be linked to the mixed DNA profile that has posed challenges for investigators.

"Not after it is cleaned for contamination," she said. "They have that process in good shape, but it can take some time." 

Authorities have indicated that one of the key hurdles in the case is a mixed and partial DNA sample that has not been strong enough to generate a usable profile for database comparison.

No match in CODIS

Earlier in the investigation, the sheriff’s department submitted DNA samples to the FBI’s Combined DNA Index System, known as CODIS, but the results did not yield a match. Officials later ruled out any connection based on that search.

Investigators also identified a separate mixed sample believed to contain DNA from three or more individuals. Experts suggest that the complexity of the sample has made analysis significantly more difficult. 

"I would assume it would be Nancy plus two or more unknowns," Moore said.

Authorities have previously confirmed that at least one contributor to the sample is male.

Clues yield limited results

Other forensic evidence processed so far has provided limited breakthroughs. Blood found on the front porch was confirmed to belong to Guthrie, while a glove recovered about two miles from her home was tested but did not match any known individuals in CODIS.

The glove was considered significant as it appeared similar to one worn by a masked individual captured on a Nest doorbell camera at Guthrie’s residence around the time of her disappearance. However, forensic analysis failed to link it to any suspect or other evidence from inside the home.

Law enforcement officials, along with Guthrie’s family, have continued to appeal for public assistance in the case. A combined reward of more than $1.2M has been offered for information leading to her recovery, including $1M contributed by the family.

Authorities have urged anyone with relevant information to contact investigators as forensic testing and inter-agency collaboration continue in the ongoing search for answers.