A chilling ransom note sent after the disappearance of Savannah Guthrie’s 84-year-old mother claimed she died shortly after being kidnapped — but investigators are warning that the disturbing message has never been verified.

Nancy Guthrie vanished from her home near Tucson, Arizona, in the early hours of February 1, setting off a massive investigation involving the Pima County Sheriff’s Department and the FBI.

Now, nearly six months after she disappeared, authorities are hoping the public release of two ransom notes and new surveillance footage will finally crack the case.

The first note demanded millions of dollars in Bitcoin in exchange for Nancy’s safe return.

The second delivered a far darker message.

“We are truly sorry,” the writer claimed after alleging that Nancy had died from a possible heart-related condition shortly after being taken.

Investigators have not confirmed that Nancy is dead, and the search for answers remains active.

Savannah, the longtime co-anchor of NBC’s Today show, shared an emotional photo of her mother on Instagram Saturday while begging anyone with information to speak up.

“This is our beautiful Mom,” Savannah wrote. “Six months ago, someone took her out of her bed in the dead of night.”

She said her family has spent every moment since Nancy’s disappearance consumed by “agony and despair.”

“Every day, we wake up and try to be strong and go on — because that’s what our joyful and resilient Mom taught us to do,” she continued. “But make no mistake — our hearts are in ruins.”

Savannah said she and her relatives spend every waking moment thinking about Nancy, searching for her and longing to bring her home.

“We are begging for help. We are desperate,” she wrote.

She urged anyone who recognizes the handwriting, wording or unusual phrases in the ransom notes to contact authorities — even anonymously.

“Someone knows something,” Savannah said. “Someone suspects something.”

She also issued a blunt warning to people treating her mother’s disappearance as entertainment or attempting to profit from the tragedy.

“You are not on her side — you are part of the harm perpetrated against her,” she wrote.

According to investigators, the first ransom note arrived at a local television station on February 2, one day after Nancy was reported missing.

The writer claimed Nancy had been kidnapped and was being held for ransom.

“We have your mother Nancy,” the note began. “She is safe but scared.”

The message demanded the equivalent of $4 million in Bitcoin by February 5. It threatened to increase the ransom to $6 million if the first deadline was missed.

The writer claimed Nancy would be released within 12 hours of receiving the payment.

But the note also contained a horrifying threat.

“If payment is not received by the last deadline on Monday the 9th at 5PM, she will be killed,” it stated.

The writer warned Savannah not to negotiate and claimed law enforcement would be unable to help.

The message also included specific details about Nancy’s home, including a white smartwatch allegedly found near the foot of her bed and a damaged floodlight in the backyard.

Investigators have not publicly confirmed whether those details could have been known only by someone involved in Nancy’s disappearance.

A second message was sent to media outlets on February 6.

This time, the writer claimed Nancy was already dead.

“We did not fully grasp the seriousness of her physical condition,” the note stated.

The author claimed Nancy “perished shortly after she was taken” and suggested her death may have been heart-related.

“We never intended to hurt her,” the writer claimed. “That was not our intention.”

The message then made an even more disturbing allegation.

“She is buried in nature now,” it stated.

The note ended with an apology to the Guthrie family.

“Nothing you could have done could have changed the outcome,” it read. “We want your family to know this and hope you all can find peace. We are truly sorry.”

Authorities have stressed that the claims in the note remain unverified. The message is not considered proof that Nancy died or that the writer was actually involved in her disappearance.

Detectives believe the ransom notes could contain clues about the author’s identity.

Investigators are studying the writer’s grammar, vocabulary, sentence structure and repeated phrases in hopes that a relative, friend, coworker or acquaintance will recognize the unusual style.

Authorities are also asking people to think back to the days surrounding Nancy’s disappearance.

They want to know whether anyone they know suddenly changed their appearance, acted unusually, missed work, left town without explanation or began cleaning or repairing a vehicle.

Investigators are also interested in anyone who showed an unusual fascination with — or sudden avoidance of — Nancy’s neighborhood or the investigation.

Homeowners in the area have been asked to review and submit surveillance footage that could show suspicious people or vehicles.

A combined reward of more than $1.2 million is now available for information that helps solve the case.

That total includes $100,000 from the FBI, $102,500 from Southern Arizona’s 88-CRIME program and $1 million offered by the Guthrie family.

Tips can be submitted to the FBI or the 88-CRIME tip line, and information may be provided anonymously.

Nancy was last seen on the evening of January 31 at her home in the Catalina Foothills area outside Tucson.

Investigators believe she was taken from the property during the night or early the following morning.

Evidence discovered inside the home reportedly included blood matching Nancy’s DNA.

Surveillance footage also showed a masked individual near the residence, and authorities said someone appeared to tamper with the home’s doorbell camera before Nancy vanished.

Those findings led investigators to treat the case as a possible kidnapping rather than a voluntary disappearance.

However, authorities have not publicly identified the masked individual or announced any arrests directly connected to Nancy’s disappearance.

Investigators have not confirmed whether Nancy is alive or dead.

The first ransom note claimed she was being held captive and could be released in exchange for cryptocurrency.

The second claimed she had died shortly after being taken and was buried somewhere “in nature.”

Neither claim has been independently verified.

The Pima County Sheriff’s Department and the FBI continue to investigate, and authorities say the case remains open.

Savannah stepped away from Today following her mother’s disappearance to focus on her family and the investigation.

She returned to the NBC morning show on April 6 after an absence of roughly two months.

NBC reportedly put special procedures in place to handle any breaking developments in the case while Savannah was on the air.

Since returning, she has continued speaking publicly about her mother and pleading for information.

For Nancy’s devastated family, the message remains the same: Someone knows what happened — and it is not too late to tell the truth.