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MOSCOW, Idaho -- A northern Idaho man serving at least 20 years in prison after pleading guilty to killing his wife and unborn child and then starting a fire wants to withdraw his guilty pleas.

The Lewiston Tribune reports that Silas B. Parks filed the motion Wednesday in 2nd District Court contending the guilty pleas weren't made knowingly, voluntarily and intelligently.

Parks also says his attorneys failed to adequately investigate the cause of Sarah Parks' death before and during plea negotiations.

Silas was 25 years old when prosecutors say he strangled or suffocated a pregnant Sarah Parks, who was a 28-year-old school teacher, and then set fire to their Moscow home in the summer of 2009. An autopsy found that Sarah Parks was dead when the fire started.

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