Savannah Guthrie is renewing pleas to neighbors, friends and residents of Tucson, Arizona, to jog their memories in the hopes of sparking new leads in the disappearance of her mother, Nancy.

The “Today Show” co-host posted a new family statement on her Instagram account Sunday morning, hours after the show’s Instagram account shared it.

After expressing gratitude to the community, the family said in its statement that it believes someone in Tucson or in southern Arizona may “hold the key to finding the resolution in this case.”

“Someone knows something. It’s possible a member of this community has information that they do not even realize is significant,” the family said.

The family urged people to go back over their memories between Jan. 31 — when Nancy Guthrie was last seen — and Feb. 1 as well as the evening of Jan. 11.

“Please consult camera footage, journal notes, text messages, observations, or conversations that in retrospect may hold significance,” the statement said. “No detail is too small.”

They also acknowledged in the statement that their family’s matriarch may no longer be alive.

“We cannot grieve; we can only ache and wonder,” they said.

Law enforcement sources told CBS News last week that additional images were recently obtained from surveillance cameras installed at Nancy Guthrie’s Tucson home but nothing was deemed suspicious. No images reviewed showed the suspect captured on the front door camera, sources said.

Lance Leising, a retired FBI supervisory special agent, told CBS News it all points to “a lack of meaningful leads.”

“It becomes much harder to keep the investigation going, keep it current and fight for new leads,” he added.

Nancy Guthrie was reported missing on Feb. 1. Authorities believe the 84-year-old was kidnapped, abducted or otherwise taken against her will. DNA recovered from the scene is still being analyzed, with investigators turning to forensic genetic genealogy in hopes of breaking the case open.

The FBI released surveillance videos of a masked man who was outside Guthrie’s front door on the night she vanished.

The Guthrie family has offered a $1 million reward for information leading to the recovery of their mother.

Savannah Guthrie visited the NBC “Today Show” studio in New York City for the first time since her mother’s disappearance on March 5. The show said she plans to return to the air at some point but “remains focused right now supporting her family and working to help bring Nancy home.”

Tucson is a little over 100 miles south of Phoenix and 70 miles north of the Arizona-Mexico border. The Catalina Foothills, the neighborhood where Nancy Guthrie lives, is known as an affluent area with popular hiking trails.

Savannah Guthrie has been a co-anchor of the venerable NBC morning show since 2012. One of her former colleagues, Hoda Kotb, has returned to “Today” to fill in while Guthrie has concentrated on finding her mother.