Investigators are examining mixed DNA evidence from Nancy Guthrie's home. A hair sample recovered from the scene has yielded inconclusive forensic results. Multiple laboratories across the nation are working to analyze the complex DNA sample. Authorities believe Nancy Guthrie was abducted from her Tucson residence. The Pima County Sheriff's Department continues to pursue leads in this ongoing investigation.

Pima County Sheriff Chris Nanos said authorities are “working this as hard as we can” after Savannah Guthrie’s latest plea for the return of her missing mother.

Authorities continue investigating Nancy Guthrie's six-month-old disappearance from her Tucson home. Sheriff Chris Nanos expressed optimism about resolving the high-profile case…