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Authorities said 39-year-old Sandra Pagniano vanished while she was in the process of divorcing her husband in May 2017.
Ms Pagniano's body was found bound and gagged in packing tape inside a grave in a rural area north of Prescott.
The county medical examiner's office confirmed she had been buried alive.
Officials said evidence showed she vigorously struggled while she was in the grave and may have been conscious for up to five minutes.