Nancy Guthrie Update Today: 'America's Most Wanted' Host Reveals What 'Sticks Out' in Case

As the search for Nancy Guthrie enters its second month, one of America's most prominent missing persons advocates is speaking out — and he knows better than most what the Guthrie family is going through.

Callahan Walsh, co-host of America's Most Wanted and executive director of the National Center for Missing and Exploited Children, told Fox News Digital there is "a lot that sticks out" in Nancy's disappearance. Chief among them: her age.

"Not many seniors go missing," Walsh said, noting that when they do, it typically involves wandering or disorientation — not abduction. The fact that investigators believe Nancy was forcibly taken from her Tucson home, and that nearly a month later she still hasn't been found, makes this "very much a unique case," he said.

"The way this investigation has ebbed and flowed, it's gone from hot, to cold, to hot [and] back to cold again," Walsh added. "Our hope is that Nancy is found alive, that she is brought home and reunited with her family."

A Personal Connection to the Pain

Walsh's perspective on missing persons cases isn't academic. In 1981, his six-year-old brother Adam Walsh was kidnapped and murdered — a case that changed American law enforcement and inspired his father John Walsh to create America's Most Wanted. Callahan Walsh now co-hosts the show alongside his father.

"The two weeks that we looked for Adam, my parents couldn't sleep. They would do anything to get Adam back," Walsh said. "And we know what the Guthrie family is going through."

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Video obtained by FOX Digital shows a dozen cars triggering a camera's motion detectors as they sped by in the hours after Nancy Guthrie's abduction. One video was taken 48 minutes after the kidnap suspect was caught on Guthrie's front door. It was also eight minutes after Guthrie's pacemaker disconnected from her cell phone, which is the moment she is thought to have been taken from her house. Criminologist Casey Jordan says the video may not move the investigation any further. NancyGuthrie Investigation CrimeNews Tucson TrueCrime

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Savannah's $500,000 Donation

Beyond the $1 million family reward for Nancy's recovery, Savannah Guthrie has pledged $500,000 to the NCMEC — a donation Walsh called deeply meaningful.

"Not only will this money go directly to the programs that help bring these kids home, but it will also go to raise awareness on other cases that aren't getting the attention they deserve," he said. "It speaks the world of their character."

Walsh said the $1 million reward could also prove to be "the motivating factor" that finally breaks the case open. "This amount of money is life-changing. This could really get somebody to second guess why they've not been truthful about what they know," he said, "and could be the reason that they finally come forward with that piece of information that the family is desperate for."

On the challenge of sifting through more than 1,500 tips now flooding the FBI's line, Walsh offered a characteristically grounded take. "It's like looking for a needle in a stack of needles," he said. "As tiny as you might think it is, it might be that little bit of the puzzle that law enforcement has been looking for this whole time."

"We know her family will never give up hope," Walsh said. "We will never give up hope and law enforcement won't either."

Anyone with information is urged to call 1-800-CALL-FBI. Tips can be submitted anonymously.