Why Nancy Guthrie's disappearance isn't considered a cold case: The crucial clues that could solve the mystery

Nearly seven months after Nancy Guthrie disappeared from her Tucson, Arizona, home, investigators are still working to determine what happened to the 84-year-old mother of Today anchor Savannah Guthrie.

Despite the length of the investigation, the case hasn't been classified as a cold case, and authorities continue to pursue several potentially important leads.

Nancy was reported missing on February 1 after she failed to attend a virtual church service. Her disappearance quickly attracted national attention, with investigators eventually treating the case as an apparent abduction.

A $1 million reward remains available for information that could help authorities locate Nancy or lead to a breakthrough.

NewsNation senior national correspondent Brian Entin , who's followed the investigation closely, says the level of resources devoted to the case is unusual.

According to Entin , FBI agents and local detectives remain assigned to Nancy's disappearance as their full-time responsibility. Investigators are also meeting regularly, allowing new information and evidence to be assessed as it emerges.

That continued commitment is one reason Entin remains optimistic that the mystery could eventually be solved. He has also pointed to advances in forensic technology, particularly DNA testing, as a potential game changer.

“I really still feel that there’s going to be a resolution and that [detectives are] going to solve it. I just know through my sources how many people are working behind the scenes,” he told Us magazine.

DNA evidence recovered inside Nancy's home is among the most closely watched pieces of evidence. Investigators have been working to analyze biological material that could potentially reveal another person's involvement.

While some testing hasn't produced a usable profile, forensic science continues to advance, meaning evidence that can't be fully interpreted today could potentially provide answers in the future.

The clues that could eventually crack the case

Surveillance footage is another significant element of the investigation. Video captured around Nancy's home showed a masked individual near a doorbell camera around the time she vanished.

Establishing who that person was, how they reached the property and where they went afterward could help investigators build a more complete timeline.

Authorities have also released ransom communications connected to the case. One message reportedly demanded millions of dollars in cryptocurrency, while another claimed Nancy had died and provided information about where her body had supposedly been left. Investigators haven't publicly identified a suspect or person of interest.

The discovery of human remains in the Tucson desert has also sparked speculation because of the proximity to Nancy's home.

However, authorities said there was no indication the remains belonged to her, and investigators later determined they weren't connected to her disappearance.

Such discoveries aren't unusual in southern Arizona. The harsh Sonoran Desert is vast, and extreme heat, flash flooding, animals and difficult terrain can make both searches and identification exceptionally challenging.

Pima County receives numerous sets of unidentified remains each year, many believed to involve people who died while attempting to cross the border.

Until authorities determine what happened, Nancy's disappearance remains an active investigation, and one new clue could still provide the answer her family has been waiting for.