Hair discovered at the Tucson, Arizona-area home of Nancy Guthrie, mother of "Today" show host Savannah Guthrie, has been tested and does not match any suspect in her abduction, Pima County Sheriff Chris Nanos announced Thursday.
"The hair was done ... and there was nothing," Nanos said in an interview with ABC News. This leaves a mixed sample of DNA retrieved from Nancy Guthrie's home as the sole piece of known biological evidence in the case, and one that has not yet been definitively linked to a suspect.
Sheriff Nanos revealed that the DNA sample contains a mix from as many as four individuals. It is currently unclear if the technology exists to untangle the sample, although Nanos indicated that multiple laboratories across the country are attempting the complex analysis, including the FBI lab in Quantico, Virginia, and facilities in Kansas, Florida, California, and Arizona.
"My understanding is there are at least five, maybe six, labs across the country that are working on all of this," Nanos said. "We have some of the brightest minds in the nation, if not the world, working on this."
Investigators believe Guthrie, 84, was taken from her home in the early hours of Feb. 1 by a masked individual captured on her doorbell camera. Six months later, Sheriff Nanos has not ruled out the possibility that the masked individual had assistance.
"I don't think anybody's here ready to say it's one guy, it's 10 guys," Nanos stated. "Did he have help? Could have."
Nanos expressed confidence that the case remains solvable and commended Savannah Guthrie for maintaining public attention on the case through her social media posts, including one shared recently. "Somebody in our community, somebody out in this world knows something. Call us, tell us, give us that information. Somebody knows where Nancy's at. We need their help," the sheriff urged.