A former Goldman Sachs Group Inc computer programmer who was cleared of federal charges in February faces new charges of illegally using and copying the firm’s high-frequency trading code, according to an arrest warrant filed in Manhattan criminal court.

The charges, brought by the office of Manhattan District Attorney Cyrus Vance, are a new twist in a case first brought by U.S. federal prosecutors in July 2009.

The programmer, Sergey Aleynikov, was found guilty at trial in December 2010 of theft of trade secrets. A U.S. appeals court reversed his conviction and he was released from prison in February after serving nearly one year of an eight-year sentence.

Read More: Reuters