LA CROSSE, Wis. (AP) — A La Crosse dentist who prosecutors say directed his patients to pay in cash has been sentenced to six years in prison for tax evasion.

The U.S. Attorney’s Office said Tuesday 71-year-old Frederick Kriemelmeyer did not file tax returns from at least 2013 through 2015.

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By 2012 the IRS assessed Kriemelmeyer for more than $450,000 in taxes, interest, and penalties, according to prosecutors.

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Kriemelmeyer took a number of actions to avoid paying the taxes he owed. He directed his patients to pay him in cash or by check with blank payee lines and paid his business and personal expenses with third-party checks and cash, officials said.

U.S. District Judge William Conley also ordered Kriemelmeyer to serve three years of supervised release and to pay nearly $227,000 in restitution.

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