Why did the FBI contact Mexican authorities in Nancy Guthrie case?

Expanding the probe beyond state lines

Investigators broadened the search for the 84-year-old after early leads suggested the suspect or the trail might have left the Tucson area. The FBI reached out to Mexican counterparts as part of a wider effort to follow possible cross-border movements and to coordinate if the investigation produced evidence pointing south of the U.S. border. That step came as law enforcement also received a new ransom demand tied to the disappearance.

Law enforcement has pursued multiple investigatory lines in recent weeks. Authorities examined doorbell camera footage, traced a backpack purchase believed to match the one seen on the suspect, and ran DNA testing on a glove recovered near Guthrie’s home. Initial DNA comparisons to national crime databases came back with no matches, so the agency moved to genealogy testing and additional lab work. Investigators have also emphasized the significance of medical devices and records — notably a pacemaker — as possible sources of information about timing and circumstances.

Major investigative actions to date:

• Doorbell footage and neighborhood canvassing to identify the person on video.
• Review of retail records (including a Walmart purchase) for the suspect’s backpack.
• DNA testing on a glove found near the area; results did not match CODIS entries, prompting genealogy work.
• Coordination with the FBI and, at the agency’s request, outreach to Mexican authorities given the possibility of cross-border movement or links.

Officials say the case remains open and complex. Sheriff and federal statements stress that no suspects have been publicly identified and that investigators are following every credible lead — domestic and international — to locate her and understand who targeted her and why.