O.J. Simpson has been hit by a new tax lien that now makes the total debt owed to the IRS $515,017.10. Simpson previously owed $318,566.04, but the IRS added a new lien for the three years between 2007-2010.

Simpson's debt has grown due to his failure to pay taxes for a total of four years: 2000 and 2007-2010. He has been in prison since 2010, and is serving a 33-year sentence for armed robbery after attempting to recover sports memorabilia. Simpson has had financial troubles since 2007 when his assets were frozen in order to pay Ronald Goldman's family $33.5 million in damages.

"He can no longer move assets around. We think that is very significant," Goldman family lawyer Jonathan Polak told Contactmusic at the time.

The State of California initially filed a lien against Simpson for $318,566.06 in taxes but he has reportedly failed to make any payments to the government, TMZ reported. Now the government has filed a third lien in order to collect all the money due. His debt has increased to roughly over half a million dollars.

Simpson still receives income from his NFL pension, which the IRS may begin claiming in order to get its money. He also had some income from his controversial book, "If I Did It," which many saw as a confession to the murders of his ex-wife Nicole Brown Simpson and Ronald Goldman.

"It's all blood money, and unfortunately I had to join the jackals," he told the Associated Press about writing "If I Did It." "It helped me get out of debt and secure my homestead. I've been pimped for 12 years. Everyone's made money on me."

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Yet the homestead was not secured, and one of Simpson's homes went into foreclosure. The book also did not help him pay his debt to the Goldman family or to the government.

According to the Associated Press, "his NFL pension and Florida home cannot be seized," which means that Simpson will have to find another way to dig himself out of debt.