the u.s. attorney 's office says mystic pizza 's 48-year-old owner john zelepos faces up to 15 years in prison .
he has pleaded guilty to tax evasion and financial structuring offenses .
prosecutors between 2006 and 2010 , zelepos diverted just over $ 567,000 from mystic pizza 's gross receipts .
he diverted the money into his personal bank accounts and those of family members , they said .
prosecutors said zelepos also made bank deposits under $ 10,000 to skip currency transaction reports filed by banks .
mystic pizza became a tourist attraction after julia roberts starred in a 1988 movie about the lives of three waitresses working there .