Any coroner who shall knowingly charge to any person, or present to the county commission for allowance, any items of fees, costs and expenses not authorized by law, or for any service not actually performed, shall be deemed guilty of a misdemeanor, and, on conviction thereof, shall forthwith be removed from office. Such removal shall be declared in the judgment for such misdemeanor, and thereupon the office of such coroner shall be declared vacant, and his successor appointed according to law.