Anne Gruber, who was attacked by him 15 times, spoke out after Walker made it clear yesterday he has no intention of resigning even if he is imprisoned for decades of violence against women.
Mrs Gruber said: "He thinks he is above the law. He just can't seem to realise he caused so much damage."
Mrs Gruber said the fact he was able to stay at Holyrood was a travesty.
More than 80 MSPs across all parties have signed a motion calling for him to step down.
However, the Dunfermline MSP, who was elected under the SNP banner but who has been expelled from the party, said: "I never had any plans to vacate my seat and that's it. I will just leave it at that."
Scottish Liberal Democrat leader Willie Rennie tabled the motion calling on Walker to step down and, despite MSPs being absent while the Parliament is in summer recess, dozens have signed it.
Mr Rennie said he hoped more would sign it in the coming days.
He said: "I don't think I have met anybody who doesn't want to sign it."
"We cannot allow a wife-beater to take his place back in Parliament as if nothing has happened.
"What would be the message it would send to all these women who have been beaten up by their partner?
"What would they think about their Parliament acting in that way?"
Mr Rennie said he had already had people from Walker's constituency of Dunfermline contact him instead of their MSP "because they believe Bill Walker cannot represent them any more".
On that basis, the LibDem leader said Walker "can't do his job, he can't function as an MSP".
Scottish Conservative leader Ruth Davidson said: "Sadly, it's no surprise someone found guilty of conducting a campaign of violence against women is refusing to do the right thing and resign his post.
"It is appalling that Bill Walker thinks he can just carry on as an elected member of Parliament as if nothing has happened.
"Ultimately, it is for Bill Walker to examine his conscience and decide if he thinks it would be right to take a large sum of public money from a situation caused by his own misdemeanours. However, let's not forget that if the SNP had taken on board the warnings about this man's violent past then we would never be in this position."
Walker, 71, from Alloa, Clackmannanshire, is due to be sentenced next month after being found guilty of 24 charges spanning almost three decades following a trial at Edinburgh Sheriff Court.
He carried out the attacks against his three former wives and a stepdaughter between 1967 and 1995.
Electoral law states any elected member jailed for more than one year will be disqualified.
However, in summary cases heard in sheriff courts in Scotland, the maximum sentence that can be handed down is one year. Therefore, Walker could remain as an MSP.