Former FBI agent offers new theory about Nancy Guthrie's disappearance: 'Personal grievance'

A erstwhile FBI cause believes that investigators should research a caller imaginable space successful the mysterious disappearance of Nancy Guthrie.

Jonny Grusing worked successful the FBI’s Denver Division for 25 years, investigating convulsive crimes, missing persons, serial killers and more. He is besides the writer of "The Devil I Knew: Unmasking a Serial Killer," astir the existent transgression lawsuit of Scott Kimball. 

Grusing made it wide that helium is lone operating disconnected of accusation that has been made nationalist successful the case, and that he's positing a caller mentation successful lawsuit it mightiness jog the representation of a subordinate of the nationalist who could assistance lick the case.

"The archetypal happening helium does is with his glove, and with his glove, it doesn't look similar he's trying to instrumentality [the camera] off," said Grusing of the suspect's behaviour connected Guthrie's stoop. "It looks similar he's trying to screen it with his close hand. "And past helium looks down, helium looks around, and helium gets the branches, and helium puts the branches up successful beforehand of it."

Photos released connected Feb. 10, 2025, amusement a "subject" connected Nancy Guthrie's property.  (Provided by FBI)

"Is determination a chance, since we don't person audio, that helium is either knocking connected the doorway loudly oregon that helium has pressed the ringing doorbell, [that] he's trying to get Nancy to reply the door, and he's shielding himself from being seen arsenic a masked person, truthful she will, successful her confusion, unfastened the door?" Grusing asked rhetorically.

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Grusing said that if that's the case, the fishy apt wasn't determination to rob the home. Since Guthrie lives successful a sprawling residential area, Grusing besides believes it improbable that the fishy was a robber who accidentally showed up astatine the incorrect address.

Rather, helium said, the fishy mightiness person been determination due to the fact that helium had a idiosyncratic grievance against Guthrie, and mightiness person lured her retired of the location onto her porch.

Drops of humor look to beryllium connected the beforehand entranceway to Nancy Guthrie's location successful Tucson, Arizona, Tuesday, February 3, 2026. Guthrie was past seen connected Saturday night. (Derek Shook for Fox News Digital)

The anticipation makes adjacent much sense, Grusing said, erstwhile considering that humor was recovered spattered connected Guthrie's beforehand structure and down the driveway, and authorities person not released immoderate accusation astir whether determination was humor recovered wrong the home.

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The fishy besides wore a weapon successful what is believed to beryllium a inexpensive Walmart holster, and wore it connected the beforehand of his body, which Grusing described arsenic not "tactically sound." Grusing besides believes that the gunman would person had occupation firing that weapon with the gloves helium was wearing, and that the weapon whitethorn person conscionable been a prop to instill fearfulness successful Guthrie.

"So, if the gun's a prop, if he's shielding himself from being seen, if he's really ringing the doorbell oregon knocking connected the door, getting her to come, helium wants to face her astir thing successful my opinion," said Grusing.

An undated photograph of Nancy Guthrie and Savannah Guthrie was provided by NBC successful effect to the disappearance of the 84-year-old parent of the "Today" amusement host. (Courtesy of NBC)

Grusing has ever believed that successful immoderate enactment Guthrie had with the suspect, thing went wrong, causing him to region her from the house. Perhaps, helium said, Guthrie identified him, causing a panic. He besides says the kidnap-for-ransom mentation doesn't adhd up, fixed that alleged kidnappers ne'er reached retired to the Guthrie household directly.

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Grusing wouldn't speculate connected what benignant of grievance idiosyncratic mightiness person had with Guthrie, oregon wherefore they mightiness person had it.

But helium wants the nationalist to see the possibility, conscionable successful lawsuit they retrieve idiosyncratic saying they were wronged by a idiosyncratic fitting Guthrie's description.

FBI agents canvass homes adjacent Nancy Guthrie's location successful Tucson, Friday, Feb. 6, 2026. Guthrie was past seen connected Saturday nighttime arsenic an probe into her disappearance continues. (Kat Ramirez for Fox News Digital)

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"It's hard to beryllium an adept successful quality behaviour due to the fact that it's truthful unsocial to that person," said Grusing, contempt his quarter-century of experience.

"You know, I'm conscionable trying to usage the experiences of antithetic cases and trying to use immoderate benignant of logic to this successful the hopes that idiosyncratic from the nationalist who has thought it mightiness beryllium idiosyncratic they cognize whether it's his household oregon whether present it's a coworker oregon person oregon subordinate oregon whatever, to enactment that 1 puzzle portion unneurotic that says, 'Yes, and present I deliberation it could beryllium him.'"