Gardai are to carry a full review of the murder of Sophie Toscan du Plantier.
The Garda Serious Crime Review Team will conduct the review and then provide recommendations to the local investigation team.
A spokesperson for the force said:
"An Garda Síochána continues to appeal to anyone who may have any information on this crime to contact the Garda investigation team at Bantry Garda Station 027 20860 or the Garda Confidential Line 1800 666 111."
Sophie was killed near Schull in west Cork in December in 1996.
No one has ever been convicted of her murder.