Derrick Callella of California is accused of sending texts to Nancy Guthrie’s family members asking about the Bitcoin that was demanded in a ransom letter sent to media outlets.

This comes after an FBI agent announced officials had arrested one person in connection with an “imposter” ransom demand.

Callella allegedly told officials he had been following the case on TV and “was trying to see if the family would respond,” according to the complaint filed Thursday in the U.S. District Court of Arizona. These messages “have not been linked to the February 2, 2026, ransom demand,” the complaint said.

It’s unclear if Callella has retained an attorney. The Independent was unable to identify his attorney for comment.

The FBI is offering a $50,000 reward for “information leading to the recovery of Nancy Guthrie and/or the arrest and conviction of anyone involved in her disappearance.”

Pima County Sheriff Chris Nanos told CNN the terrain near Nancy Guthrie’s home has made it difficult to obtain security footage.

She lives in Catalina Foothills, an affluent community near Tucson, Arizona.

Nanos said Nancy lives in an area that’s “not well lit.” He described it as a “very suburban, rural area of the Tucson area, in a very mountainous side of town where vegetation is extremely thick.”

“We are still canvassing that neighborhood and other neighborhoods and still drawing down from cameras on our streets, at our intersections, with hopes that maybe we’ll find something,” Nanos told CNN.

The Pima County Sheriff’s Office has revealed an updated timeline of the events leading up to Nancy Guthrie’s disappearance.

• Saturday, 5:32 p.m.: Nancy travels to a local family member’s home for dinner.
• Saturday, 9:48 p.m.: Family members drop Nancy off at her home, and her garage door opens.
• Saturday, 9:50 p.m.: Nancy’s garage door closes.
• Sunday, 1:47 a.m.: Nancy’s doorbell camera disconnects.
• Sunday, 2:12 a.m.: Software detects a person on the camera (authorities have said there is no video available).
• Sunday, 2:28 a.m.: Nancy’s pacemaker app shows it disconnected from her phone.
• Sunday, 11:56 a.m.: The family checks on Nancy after hearing she did not attend church.
• Sunday, 12:03 p.m.: 911 call made to Pima County Sheriff’s Department.
• Sunday, 12:15 p.m.: Patrol car arrives at Nancy’s home.

Pima County Sheriff Chris Nanos said investigators have interviewed the Uber driver who took Nancy Guthrie to a family member’s house for dinner on Saturday.

“We did speak to a driver, because Nancy, we learned, had been taken by Uber to the family residence, the daughter’s, for dinner. And we located that driver and spoke with them and got that information,” Nanos said.

Family members brought Nancy back home shortly after 9:45 p.m., he said.

President Donald Trump watched today’s press conference about the search for Savannah Guthrie’s mother, White House Press Secretary Karoline Leavitt said.

“The president, as you all know, spoke directly with Savannah yesterday and told her that the federal government is here to help. Any requests that are made by state and local officials in the search of Mrs. Guthrie will absolutely be accommodated,” Leavitt said.

“I spoke with the FBI directly about that today as well, and our hearts and our prayers are with Savannah and her entire family as they search for her dear mother,” she continued.

Pima County Sheriff Chris Nanos and FBI Phoenix Special Agent in Charge Heith Janke hosted a press conference today to update the public on the search for Nancy Guthrie.

Here’s what we learned:

• Investigators believe “Nancy is still out there,” according to Nanos.
• Police have not identified any suspects or persons of interest.
• Investigators are looking into a ransom note that was sent to media outlets. The note listed an initial deadline of 5 p.m. Thursday, along with a second deadline next Monday, Janke said.
• There has been ”no contact” since the letter was sent, and “no proof of life,” according to Janke.
• Blood previously found on Nancy’s porch was identified as hers, Nanos said.
• Nancy’s doorbell camera disconnected Sunday morning around 1:47 a.m, and at 2:12 a.m., “software detected a person on camera,” Nanos said. Less than 20 minutes later, Nancy’s pacemaker app disconnected from her phone.