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SEATTLE -- Police say they've taken their best shot at finding missing Utah mother Susan Powell. Her dad is hoping a review of the newly released case file -- containing tens of thousands of pages -- might turn up something the investigators missed.

Chuck Cox told reporters Tuesday in Seattle that a private eye has offered to help comb through the records.

Susan Powell disappeared in December 2009, and her husband, Josh Powell, was long a suspect. Last year, he killed himself and the couple's two young sons. Investigators now believe Powell's brother, Michael, helped dispose of Susan's body.

Michael Powell committed suicide three months ago. Authorities announced Monday that they were closing the active part of the investigation. They insist they never had enough evidence to charge either brother.

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