Ian Bailey will find out today if the latest bid to have him surrendered to French authorities has been successful.
This is the third time he has had to go through the extradition process in relation to the death of Sophie Toscan du Plantier.
In December 1996, the body of Ms Toscan du Plantier was found outside her holiday home in Schull, West Cork.
The French filmmaker had been beaten to death.
Ian Bailey became a suspect but has never been charged with her murder in Ireland and continues to insist that he had nothing to do with it.
In his absence, a court in Paris convicted him of murder last year and sentenced him to 25 years in prison.
On the back of that conviction, authorities in France are now seeking his surrender for a third time.
The 63-year-old will find out this afternoon if the High Court in Dublin is going to approve its application.
Reporting from Frank Greaney