OLYMPIA, Wash. -- The Washington Corrections Department says the father-in-law of missing Utah mother Susan Powell won't be released from prison Thursday.

He's been serving time for recording images of two neighbor girls in their bathroom.

Corrections spokesman Chad Lewis said May 23 was the earliest possible date on which Steven Powell could be released, based on sentence reductions he earned in prison. Powell was sentenced in June 2012 to 2 1/2 years.

Susan Powell home video:'If I die, it may not be an accident'

To get out early, inmates must submit an acceptable release plan. Lewis says the state is still reviewing Powell's proposed plan. If it's approved, the state still requires 35 days to allow staff to notify victims and local law enforcement.

Police in Utah said this week they were closing the active part of the Susan Powell investigation. She disappeared from her home in 2009.

Her husband Josh was a focus of the investigation until he killed himself and the couple's two children last year in an explosive house fire in Washington state.

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