The Garda Commissioner has said the review of the investigation into the murder of Sophie Toscan du Plantier is "not a futile exercise" and will be fully resourced.
Drew Harris said the gardaí have been through a process and have decided the review of the case and all evidence gathered since the first report of the murder in December 1996 is worth doing.
He said the intention is to identify a suspected perpetrator and report that person to the Director of Public Prosecutions.
The Commissioner also appealed to anyone with any information on the case to come forward.
There is, he said, a lot of information out there and something may have been triggered in an individual's mind.
He said they will revisit all of the evidence and all witnesses and "it will be a very thorough piece of work".
Commissioner Harris said the gardaí are approaching this with an open mind and did not wish to comment on statements by Ian Bailey or others.
He said the gardaí have looked at the existing information and they now need to apply to it the most modern and up-to-date techniques.
He said the review may prove really important and worthwhile in terms of identifying "the perpetrator of this awful crime".
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Former journalist Ian Bailey was convicted in his absence of the murder of Ms Toscan du Plantier by a French court three years ago.
Mr Bailey has always maintained his innocence in relation to the killing.
His solicitor Frank Buttimer said yesterday that his client "is very happy that An Garda Síochána have decided to carry out a cold case review".and has welcomed the garda decision to review the case.