Published: Oct 06, 2010 4:09 PM EDT
Updated: Oct 06, 2010 1:09 PM EDT

NEW YORK (AP) - A Florida businessman who once had a stake in the Smurfs cartoon empire is having second thoughts after pleading guilty in New York to trying to shake down his son-in-law for $11 million.

In August, Stuart R. Ross of Aventura, Fla., pleaded guilty and was promised probation. But his lawyer, Matthew Myers, said Tuesday that Ross might try to withdraw his plea.

Myers says Ross took the plea deal "under extreme duress" while suffering from serious medical problems in jail.

Prosecutors had no immediate response. Ross would need to make a formal request and get a judge's approval to take back the plea.

Ross and his son-in-law, a financier, have said in court papers that Ross owned certain rights to the Smurfs years ago.