TUCSON, Ariz. — More than eight months after Nancy Guthrie vanished from her home near Tucson, the search for the 84-year-old mother of "Today" show co-host Savannah Guthrie remains unresolved, with no named suspect, no arrest and no sign of her.

In recent days, the case has drawn renewed attention after a possible human skull fragment was found in the Tucson area, a former FBI agent disclosed that she had received suspicious ransom emails and a neighbor publicly accused authorities of letting the case fade.

The Pima County Sheriff's Department and the FBI, which are jointly investigating through a task force, have said the investigation remains active.

Skull fragment under examination

On Oct. 7, a possible human skull fragment was found in a wash in Oro Valley, a community north of Tucson in the same region where searches for Guthrie have been conducted.

The fragment was turned over to the county medical examiner. As of last week, no findings had been announced and authorities had not linked it to Guthrie's disappearance. Separate remains found in the area in August were also said not to be connected to the case.

Former FBI agent reveals ransom emails

On Oct. 12, former FBI agent Jennifer Coffindaffer said in an interview with NewsNation that she had received four ransom emails........

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