The Taoiseach says it is important that "no stone is left unturned" in the probe to bring Sophie Toscan du Plantier's killer to justice.
Gardai last week announced its Serious Crime Review Team will again look at the case of the brutal killing of the French filmmaker.
The 39-year-old mother-of-one was battered to death with a stone outside her holiday home in Toormore, near Schull in Co Cork on December 23, 1996.
