Solicitor for Ian Bailey, Frank Buttimer, has said the Government should cease co-operation with a French investigation into the death of film-maker Sophie Toscan du Plantier in west Cork in 1996.
Mr Bailey was arrested twice and questioned about Ms Toscan du Plantier's murder, but successfully resisted an attempt to extradite him to France as part of the French investigation.
A team of detectives involved in the French investigation is due in Ireland in the coming weeks to take further statements from witnesses.
Mr Buttimer said the detectives should be told not to come and that Minister for Justice Alan Shatter and the gardaí should “tell them they're not welcome in Ireland and that they have no business here” and that the murder investigation is a matter for the Irish authorities.
Speaking on RTÉ’s Morning Ireland, Mr Buttimer said the terms of reference announced yesterday by the Government for the Commission of Investigation, described a potentially very broad-ranging inquiry.
The Commission of Investigation is to examine the garda investigation into the death of Ms Toscan du Plantier and how these matters were dealt with by the responsible authorities.
Mr Buttimer said it would depend on the interpretation of the term "responsible authorities".
He said this could include the office of the Director of Public Prosecutions and the Department of Justice.