Ian Bailey's lawyers have told the Supreme Court they have received new information which reveals garda misbehaviour of the lowest standards.
The 54-year-old former journalist is fighting his extradition to France where he is wanted for questioning in relation to the murder of Sophie Toscan du Plantier in West Cork, 15 years ago.
Ian Bailey's appeal against his extradition was to be heard from next Monday, but his lawyers today told the Supreme Court new information has come to light.
Senior Counsel Martin Giblin said since Monday material has been handed over from the Department of Justice and the DPP on advice from the Attorney General.
He said it is highly relevant to the three grounds raised in the High Court against Mr Bailey's surrender to France.
He said the information revealed garda misbehaviour and added the extent of wrongdoing by state officers was "breathtaking, even by the lowest standards encountered by the courts" in past cases.
He said the situation is unprecedented and said more time is required to review the documents, which have also been furnished to the French authorities.
The State and the court agreed to put the case back. The next step for Ian Bailey's lawyers is to apply for the 54-year-old's bail terms to be relaxed.