WEST VALLEY CITY, Utah -- Police say they believe a missing Utah woman's brother-in-law was heavily involved in getting rid of her body.

West Valley police say the focus of the Susan Powell disappearance shifted to Michael Powell after Josh Powell killed the couple's two boys and himself in a deliberately set house fire 15 months ago.

Police held a news conference Monday to say they are closing the active investigation of Susan Powell's disappearance citing a lack of leads. They are also releasing the case file, which includes details that have been kept under wraps since Powell vanished in 2009.

Police spent two days unsuccessfully searching in rural Oregon last week for any trace of Powell.

Police have said they would reopen the case if they get new information.

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