The state of Wisconsin is appealing a federal judge’s ruling to overturn the conviction of Making a Murderer subject Brendan Dassey.

Dassey, one of two men whose murder convictions were chronicled in the hit Netflix docuseries, was sentenced to life in prison in 2007 for his alleged participation in the death of 25-year-old Teresa Halbach. His uncle Steven Avery was found guilty of Halbach’s murder. U.S. Magistrate Judge William Duffin overturned Dassey’s conviction on August 12, ruling that the court found his confession was involuntary.

The Wisconsin Department of Justice announced today that Attorney General Brad Schimel filed a notice of appeal. “We believe the magistrate judge’s decision that Brendan Dassey’s confession was coerced by investigators, and that no reasonable court could have concluded otherwise, is wrong on the facts and wrong on the law,” Schimel said in a statement.

The 10-episode Making a Murderer chronicled — and questioned — the murder convictions of Avery and his nephew. The case gained national attention after its December premiere.