MR Alan Shatter has called on the Minister for Justice to reopen a murder and sex abuse investigation carried out by gardai in Dun Laoghaire last year.
The Fine Gael TD has also asked Ms Owen to consider reforming the law on sex abuse "to provide that the mere passage of time should not act as an obstacle to prosecutions being brought".
Mr Shatter wrote to the Minister following a report on the investigation in The Irish Times shortly before Christmas. It described how an 11 year old girl gave birth to an infant girl in south Dublin in 1973, and her claim that the baby was murdered to cover up widespread sex abuse in her family.
Last November the Director of Public Prosecutions informed gardai that he had decided not to press any murder charges or begin any other prosecutions based on the allegations of sexual abuse.
His reasons included the considerable length of time which had elapsed, and the difficulty of securing a conviction a result. Other reasons included the lack of independent evidence and any admission of guilt.
In his letter Mr Shatter said he was "gravely concerned" at the lack of prosecutions. "It seems to me, from the published information, there is a prima facie case to be brought alleging murder, assault and sexual abuse," he wrote.
"I appreciate that the DPP may have been privy to information which is not in the public domain.a However, having regard to the fact that it appears there are witnesses available who can corroborate the allegations made, and also having regard to recent developments in the area of forensic science, in particular in the use of DNA fingerprinting, I find it incredible that no prosecution of any nature has been deemed appropriate."
He was "greatly concerned" that the DPP was using the passage of time as an argument for not pursuing such cases. This "resulted in prosecutions that should be brought never seeing the light of day," he said.
"I believe that this case should be reopened by the DPP without delay and I am writing to you, as Minister for Justice, to ask that you raise this matter with the Government and that you communicate directly with the DPP.
"I also believe the Garda Commissioner should be asked to consider what additional investigative action could be taken by the gardai to facilitate the beginning of appropriate prosecutions."
The woman at the centre of the case has also written to the Minister and the Eastern Health Board about the case, and about her fears that her nine year old niece is at risk of sex abuse at present.
She has called on the Minister to introduce a system similar to the "at risk" register in Britain. This allows the social services to prevent suspected abusers from having access to children.
She told The Irish Times the main reason she gardai with her story year to highlight the fears she had her niece, and other children.
Both the child's mother and social workers say the girl is not at any risk, and that "detailed pi cautions" are in place to her safety. The mother told The Irish Times "She's not in a danger... I've had social I've had detectives, the here."
A spokeswoman for the Health Board said she could no comment on individual cases.