Ian Bailey says he is hopeful the truth will come out in the Sophie Toscan du Plantier case before he is dead.
He was speaking after Gardaí confirmed they are to conduct a full review of the case.
The French filmmaker was beaten to death with a brick and a rock outside her holiday home in Schull in west Cork, two days before Christmas in 1996.
Mr Bailey was convicted in absentia in Paris in 2019 and sentenced to 25 years - but has never been charged in Ireland.
Speaking to Newstalk, the 65-year-old says he welcomes the Garda review.
"I welcome the news that, in effect, there's going to be a cold case review.
"The one thing I would say is there've been at least two reviews before... and both of those, in my experience, have fell well-short of an independent and objective review of the case.
"So I'm just hoping that this time there's going to be an objective review of the case.
"And I have said I will cooperate in any way that I can with a meaningful and objective review".
Asked if he believes this will see a successful outcome in the case, he says: "My prayer for a quarter of a century has been that the truth at some point would come out before I was dead.
"I hope there will be [a successful outcome] and if I can give any assistance, I will be doing that.
"I would hope there would there be an acknowledgement - if not the discovery of who was the murderer of Madame Sophie Toscan du Plantier - an acknowledgement that it wasn't me.
"That's my hope... and any assistance I can give to An Garda Síochána, I will be giving".
And Mr Bailey says as far as he is aware, he has not been seen as a viable suspect in the case "from 2008 onwards".
Reporting by: Eoghan Murphy