A campaigner says she believes there can be no justice for Sophie Tuscan Du Plantier without justice for Ian Bailey.
Amanda Large says she is trying to create a positive image of him as a person, and not just the suspect in a murder case.
She told Lunchtime Live she has started a Change.org petition and a Facebook page.
"The aim of the campaign is to get justice, because there can't be any justice for Sophie without justice for Ian.
"If Ian didn't kill her, then her real killer has never been exposed.
"By opening a cold case investigation is the only way that we will ever find out - and we may not even find out definitively through a cold case investigation.
A still of Sophie Toscan du Plantier from the Netflix documentary 'Sophie: A Murder in West Cork'. Picture by: Netflix"But I can't understand that anybody... Ian is innocent until proven guilty in this country.
"So unless people, who hate him so much, don't want egg on their face I can't see why they wouldn't want a cold case investigation to definitively prove one way or the other.
"I'm not telling people 'You have to believe that Ian is innocent' - what I'm saying is give him the benefit of the doubt".
She also says some of the recent documentary material relating to him is 'laughable'.
It comes after two, separate pieces aired about the case: Jim Sheridan's 'Murder at the Cottage' on Sky Crime, and the Netflix production of 'Sophie: A Murder in West Cork'.
On this, Amanda says: "It was actually laughable some of the stuff - if it wasn't somebody's life, it would be laughable.
"For Ian Bailey, this is still his life: he is still going around with this hanging over him.
"So it isn't like a crime that somebody's gone to jail for, that nobody is going around anymore suffering because of it.
"The more I researched into it, the more I definitely felt he was innocent.
"And I really felt this is shocking the way this man has had to put up with this for years."
'Sacrificial lamb'
She says she identified with some of Ian's situation, as she is eccentric herself.
"He was guilty from word go in the eyes of the people in the area because he was different.
"And for that reason I felt quite strongly about it".
Amanda says she believes the trial in France, which found him guilty and sentenced him to 25 years in prison, holds no credibility.
Sophie Toscan du Plantier's son, Pierre-Louis Baudey-Vignaud, arrives at the Court of Appeal in Paris for the trial of Ian Bailey | Picture by: Steve Parsons/PA Wire/PA Images"Doing my research discovering that the trial in France was an intimate trial which is based on the feelings of people involved, rather than actual real hard evidence, to me kind of discredited it straight away.
"Civilised society is based on innocent until proven guilty; and that's not the case in France.
"Ian was literally a sacrificial lamb in France, end of".
But Amanda says she also empathises with the family of Ms du Plantier.
"I feel for Sophie's family, I really do - I've lost a son, so I know what it's like.
"I wanted to blame a particular person for that: I was so angry - but I feel that her family don't know Ian, have they ever even met him?"
And she says she wants people to see the other side of Ian Bailey.
"I'm trying to show people there is another side to Ian Bailey - Ian Bailey is not just the suspect.
"Ian Bailey is a person with feelings, he is a person that has had so much taken from him in his life.
"And I want people to see that end of things".
