Search border area for Nancy Guthrie: The lead that could crack missing mystery

Over 100 days have passed since the disappearance of Nancy Guthrie. Yet, the authorities have yet to find the suspect of the presumed kidnapping.

With searches for the 84-year-old having been stretched across the border to Mexico, a former SWAT commander has a place in mind he said investigators should be looking at.

The ex-Pima County SWAT commander appeared on Brian Entin's show on NewsNation.

During the interview, Entin asked Krygier about the Tohono O'odham Nation Reservation.

This is a vast reservation area that extends into Mexico from the Arizona border region.

Entin asked, "It's massive. It's right there between Tucson and Mexico. When I drove to Mexico, you drove through it."

"And it borders Mexico. Do you think that that should be part of the investigation when it comes to Nancy Guthrie?"

The ex-SWAT commander responded positively.

"Absolutely, it should be. It's huge. There's a lot; most of it is just the desert. There is an open border on the reservation."

Though the ex-commander insisted he is not suggesting Guthrie is there, he stressed the location and geography demand that investigators must look there.

However, jurisdictional limitations hinder the work of local deputies in patrolling the large tracts of the reservation.

Krygier's remarks come after an anonymous tip claimed Guthrie's body was buried near the U.S.-Mexico border.

A volunteer search group in Mexico thoroughly searched the unmarked graves but found nothing significant.

Guthrie has been missing since February 1.