St. Joseph Mich. businessman John Bertuca has begun his one-year sentence in federal prison.
The medium-security facility is located in Oxford, Wisconsin, according to our reporting partners at WSJM radio.
He was sentenced in August after pleading guilty to filing a false tax return.
Early next year, he is scheduled to testify in a trial over a Ponzi scheme, involving 800 families and $46 million.
Bertuca is the owner of the Bertuca Bonding and Insurance Company in St. Joseph. He also owns the building where the Pump House Grill used to be located. The restaurant closed earlier this year amid a highly-publicizedfinancial dispute. Bertuca used to own Casey's Bar and Grill in New Buffalo.
Bertuca accepted $345,000 in "marketing expenses" from two men accused in the Ponzi scheme. He denies any knowledge of the wide scale rip-off.