The blaze on March 8 destroyed St. Joseph Hall. Then, five days later, investigators learned that cash was missing from the seminary.
The student taken into custody is being held in the Fond du Lac County Juvenile Detention Center on charges of theft and burglary.
The teen suspect has not been charged with arson, but the fire investigation is ongoing.
If you have any information in this case, call the Fond du Lac County Sheriff's Office Tip Line at (920) 906-4777.
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