Genetic Genealogy and DNA Evidence - Part 3 of Megyn Kelly Investigates Nancy Guthrie's Disappearance | Ep. 1276 - The Megyn Kelly Show Recap

Podcast: The Megyn Kelly Show

Published: 2026-03-19

Duration: 4198

Guests: Will Geddes, James Hamilton, Susannah Ryan

What Happened

James Hamilton, Will Geddes, and Susannah Ryan dive into the complex world of genetic genealogy as a tool for solving the mysterious disappearance of Nancy Guthrie. Despite extensive testing, forensic analysts have yet to find a DNA match in criminal databases, highlighting the challenges of mixed DNA samples. Arizona's allowance for familial searching in CODIS presents a unique opportunity to identify unknown perpetrators through their relatives.

Suzanna Ryan explains that genetic genealogy is revolutionizing law enforcement by tracing familial DNA connections. Cece Moore, a pivotal figure in the field, has been using this technique to solve cases dating back to 1958. SNP testing is required for this process, which is different from traditional DNA methods and can reveal a suspect's physical features through companies like Parabon.

The Pima County Sheriff's Department discovered DNA at Nancy Guthrie's home that does not belong to her or her close contacts. This DNA is mixed, complicating the analysis. The racial composition of DNA databases poses a challenge, as Caucasians are overrepresented, impacting the likelihood of finding a match.

The possibility of a transnational criminal group being involved in Nancy's disappearance is considered, which might impact the ability to find a DNA match. Billboards featuring Nancy Guthrie have been posted across several states, possibly indicating a connection to Mexican descent. Questions arise about the effectiveness of these billboards without a perpetrator's image.

Investigator-mediated transfer is a concern, as DNA can easily be transferred from one object to another by those handling the crime scene. The longevity of DNA and its sensitivity complicate investigations, even when perpetrators take precautions to avoid leaving traces. The MVAC tool is noted for its potential to collect more DNA from surfaces than traditional methods.

Sheriff Nanos claims to have a strong suspicion about the motive behind Nancy Guthrie's disappearance but has not shared it publicly. The case remains unusual due to Nancy's age group, as less than 1% of kidnappings involve someone her age. The investigation remains complex with no solid suspects, and the coordination between the FBI and Pima County is questioned.

Key Insights

• Genetic genealogy uses familial DNA connections to identify suspects, even when direct matches in criminal databases are unavailable. This technique requires SNP testing, different from traditional DNA methods.
• The racial composition of DNA databases can affect match likelihood; Caucasians are overrepresented, impacting the identification of non-Caucasian suspects. This disparity poses challenges in diverse cases.
• Investigator-mediated transfer is a significant concern, as DNA can be transferred between objects by investigators. This complicates crime scene analysis and can lead to misinterpretation of evidence.
• Billboards featuring Nancy Guthrie have been deployed across several states, suggesting a possible Mexican connection. However, the absence of a perpetrator's image raises doubts about their effectiveness.