TUCSON, Ariz. — A retired Arizona law enforcement officer says powerful monsoon flooding may have shifted crucial evidence in the investigation into Nancy Guthrie's disappearance, after a neighbor reported seeing FBI agents return to search the desert brush behind the missing 84-year-old's home just days before the case reached its six-month mark.

The renewed search activity was spotted in the Catalina Foothills neighborhood of Tucson, where Guthrie, the mother of "Today" show co-anchor Savannah Guthrie, is believed to have been taken by force from her home in the early hours of Feb. 1. A neighbor living a few doors down told Fox News Digital she recognized faces from earlier law enforcement operations connected to the case and saw investigators methodically combing the scrubland behind Guthrie's property. A spokesperson for the Pima County Sheriff's Department, however, said no task force investigators had recently returned to the area, and the FBI has not publicly addressed the reported search.

A Landscape Reshaped by Weather

Bob Krygier, a retired Pima County Sheriff's Department lieutenant and former SWAT commander, told Fox News Digital that Tucson's monsoon season, which began roughly a month ago, may have significantly altered the terrain behind Guthrie's home, potentially exposing or displacing evidence investigators had not previously located. He described how large volumes of water arriving in short, intense bursts can push rocks and debris across the desert floor, effectively moving what he called "the environment" itself.

Krygier said floodwaters in the washes and ravines behind Guthrie's property can rise anywhere from a few inches to as much as 12 feet, generating enough force to sweep away vehicles, trees, rocks and even people. He........

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