It appeared to visually match the one worn by a masked suspect on released Ring doorbell footage.

However, police said it had found additional DNA evidence which had not yet been analysed.

This marks the third week of the hunt, with no arrests or suspects named.

But a DNA expert has revealed her “biggest question” hanging over the case on its 18th day.

CeCe Moore said the glove was unlikely to identify a suspect, adding that it was too far from the crime scene.

She said: “My biggest question is, have they found DNA from an unknown male inside that house?”

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The FBI has confirmed they are now using investigative genetic genealogy (IGG) to search for suspects.

The forensic technique uses public genealogy databases to find potential relatives when traditional law enforcement databases produce no results.

Mrs Moore said “it is just a matter of time now” until a suspect is found using IGG.

Authorities have said they also found 16 gloves scattered near Nancy’s home, most of which were found to belong to investigators on the scene.

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The sheriff said 400 investigators are continuing to analyse over 40,000 tips.

Authorities have also cleared the Guthrie family, naming them as victims of the case.

Nancy’s son-in-law Tommaso Cioni faced unfounded online speculation that he was involved in the case.

Delivery driver Carlos Palazeulos was apprehended in Rio Rico, Arizona, around 60 miles from Nancy’s Tuscon home in connection with the case, but was released without charge after several hours.

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Answering questions from the press, he said he was not familiar with the case and he was only read his rights two hours after he was held.

Mr Nanos has dispelled claims the case has gone cold.

He said: “As long as we have the ability to chase a lead, it’s not cold.

“We’re not going to give up. We’re going to find Nancy, and we’re going to find out who did this.”