Citing a lack of leads, West Valley City, Utah, police say they are is closing the active investigation of the disappearance of Susan Powell.
Powell vanished in 2009 and her now-dead husband was a prime suspect.
Josh Powell maintained his innocence and said he had taken the couple's young boys on a midnight camping trip in freezing temperatures the night she was last seen.
He eventually returned to the couple's hometown of Puyallup, Wash., where he killed himself and the couple's two boys last year.
Josh Powell was never charged in his wife's disappearance, but unsealed documents say authorities found Susan Powell's blood on a floor next to a sofa that appeared to have been recently cleaned.
Police last week spent two days searching in rural Oregon for any trace of Powell's body.