As the search for Nancy Guthrie enters its third week, investigators are looking into a possible new clue seen in surveillance images, according to a report from NBC.

Chris Nanos, sheriff for Pima County, Ariz., told the outlet that based on security footage from Guthrie’s home, they believe the man seen tampering with her doorbell camera was wearing a pinky ring.

“I look at the same photo you look at and I get, I see it,” Nanos told NBC on Tuesday, before saying he would have his team analyze the footage.

NBC also reports that DNA recovered from a glove found about 2 miles away from Guthrie’s home did not return any hits in a federal database.

Guthrie, 84, was last seen Jan. 31 after being dropped off at her Tucson home by family members following a dinner outing.

The FBI released surveillance footage from Nancy Guthrie’s home which showed a man tampering with her doorbell camera on the morning she disappeared.

The man was described as being between 5’9” and 5’10” tall and wearing a black Ozark Trail Hiker backpack.

Earlier this week, Savannah Guthrie—Nancy Guthrie’s daughter and “Today” show anchor—posted to her social media, saying her family remained hopeful for her mother’s return.

“I just wanted to come on and say that we still have hope and we still believe,” Savannah Guthrie said in the video.