Mitchell pleaded guilty Friday to a single count of conspiracy to file a false claim. He faces a maximum prison sentence of 10 years and a maximum fine of $250,000.
Prosecutors say Mitchell and two others concocted a scheme that involved filing a false tax return on behalf of another professional athlete.
Mitchell allegedly told the athlete, only identified as "A.G.," that he could help him get a bigger tax refund from the I.R.S.
Prosecutors say Mitchell and his two associates filed a return on behalf of A.G. that contained blatantly false information.
A.G. was unaware that the false tax return had been filed.