DUPAGE COUNTY, Ill. (CBS) — 33-year-old Stephen Peterson was fired by the Oak Brook Police Department over his actions when his father Drew was being investigated for the disappearance of Stacy Peterson.

A police commission said he had given contradictory testimony and took three weapons from his father’s Bolingbrook home. Now DuPage County Judge Terence Sheen has upheld the dismissal.

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“We are disappointed,” said Tamara Cummings, Stephen Peterson’s lawyer. “We certainly are going to explore options and including the option of appealing to the appellate court.”

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Since his firing, Stephen Peterson hasn’t worked and is raising his own child along with his father’s younger children.

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Drew Peterson is in prison for the murder of Kathleen Savio. In a separate action, Stephen Peterson has a $10 million lawsuit pending against the Oak Brook Police Department for firing him.