Nancy Guthrie

TMZ is reporting it received a new letter amid the search for Nancy Guthrie. TMZ says the sender of the letter claimed they knew the name of the alleged kidnapper and that they reached out to Guthrie's family. The letter also demands a single bitcoin be sent to an active bitcoin address. A single bitcoin is worth about $66,000.

The investigation into Nancy Guthrie's disappearance continues to ramp up in Tucson as a man who was detained for questioning on Tuesday night has been released. FOX 10's Irene Snyder and Danielle Miller have the latest.

The Pima County Sheriff's Department is urging the public to not call 911 about the Nancy Guthrie case unless they have actual tips regarding her disappearance.

Authorities detained an unidentified person of interest Tuesday night in the case of missing 84-year-old Nancy Guthrie, just hours after SWAT vehicles were seen leaving the Pima County Sheriff’s Department. FOX 10's Taylor Wirtz has the details.

The FBI and Pima County Sheriff's Department are conducting a search warrant related to the Nancy Guthrie case in Rio Rico, located half an hour away from the U.S.-Mexico border.

A person of interest in the disappearance of 84-year-old Nancy Guthrie was detained Tuesday night, Fox News Digital confirmed. Guthrie was last seen Jan. 31 at her home in the Catalina Foothills near Tucson.

A Tucson area neighbor of Nancy Guthrie's daughter, Annie, has his home inspected on Tuesday, Feb. 10. Joe Contreras says investigators searched his surveillance videos in hopes to find clues in the Jan. 31 disappearance of the 84-year-old.

As crews continue to search for Nancy Guthrie, we are getting a look at newly-recovered surveillance images from the night Nancy went missing. Meanwhile, the FBI was back at the Guthrie home on Feb. 10. FOX 10's Steve Nielsen reports.

Tucson residents, and neighbors of Nancy Guthrie, are reacting to the newest development in the case, as authorities release doorbell camera video and images of an armed individual. FOX 10's Ashlie Rodriguez learns how this has reignited hope. 

Investigators released surveillance footage Tuesday of a masked individual seen on Nancy Guthrie’s porch the night she vanished.

In a major development in the search for Nancy Guthrie, the FBI has released new surveillance photos and video of what authorities call "an armed individual appearing to have tampered with the camera at Nancy Guthrie's front door the morning of her disappearance."

The second deadline from a ransom note in the disappearance of Nancy Guthrie, the mother of "Today" host Savannah Guthrie, has passed. Savannah is thanking the public for their continued prayers and asking for help. FOX 10's Danielle Miller reports.

Cryptocurrency experts were watching the Bitcoin ledger online for payments close to the alleged $6 million ransom in the Nancy Guthrie case. 

While law enforcement still seeks help from the public, the FBI says they were not made aware of any communication between the Guthrie family and the alleged abductors. FOX 10's Nicole Krasean has the latest after the second alleged ransom deadline has passed.

Savannah Guthrie described the search for her mother, Nancy, as an "hour of desperation" as a 2nd unconfirmed ransom deadline passed. While the investigation evolved over the past week, authorities have not verified the legitimacy of the ransom demands.