FBI analyzes key DNA in Nancy Guthrie abduction case, investigators say

The FBI was analyzing DNA recovered from Nancy Guthrie’s Tucson-area home, a development that could sharpen a long-running abduction investigation but still falls short of identifying a suspect. The sample, sent to federal agents by a private Florida lab working with the Pima County Sheriff’s Department, was described by authorities as mixed, meaning it contained genetic material from more than one person.

That detail matters. Mixed or low-level DNA can be valuable because it may place an unknown person inside a home, connect evidence across scenes, or eventually generate a profile that can be searched in CODIS or used in investigative genetic genealogy. But until analysts separate the strands and isolate a usable profile, the sample cannot by itself establish who was involved in Nancy Guthrie’s abduction, who handled the evidence, or whether the material is strong enough for a database hit.

Nancy Guthrie, 84, was abducted from her home on Feb. 1, 2026. Sheriff Chris Nanos said it could take as long as six more months to separate the strands in the home DNA and isolate what investigators need. He also said as many as five other labs around the country were working parts of the case, while about two dozen Pima County and FBI investigators remained active on the ground.

Investigators have already said that some DNA found inside the home did not belong to Nancy Guthrie, her family or anyone who worked there. Earlier reporting also raised the possibility that the material might be too low-level to produce a usable profile for federal or private-sector databases, a common limit in forensic work when samples are degraded, partial or mixed.

The case has also produced other biological leads, though none has broken it open. On Feb. 15, the FBI said it had obtained a DNA sample from a glove found about two miles from the home, where roughly 16 gloves were reportedly collected in a roadside field. That sample was run through CODIS and produced no matches.

Pima County investigators previously cleared all three of Nancy Guthrie’s adult children and their spouses as possible suspects. Savannah Guthrie said the family was offering up to $1 million for information leading to her return. For now, the investigation remains focused on turning scattered biological evidence into something actionable, a process that can be decisive when it works and frustratingly slow when the DNA is mixed, sparse or incomplete.