A REPORT into the tragedy at Lammy Crescent criticised how different agencies dealt with the case of Arthur McElhill and exchanged information about his character and previous convictions.
The Toner report, by Henry Toner QC, was published in June 2008 and made 63 different recommendations.
It also identified failings in the assessment of potential risks posed by McElhill to teenage girls, given the nature of his previous convictions for assaulting two 17-year-old girls as they slept in their beds.
As a registered sex offender, he had been under continual monitoring since 1993 but just three years before the tragedy was deemed to be "low risk" and subjected to less scrutiny than before.
In the weeks leading up to the fire, McElhill had been having a sexual relationship with a 16-year-old girl who had been staying at the family home and was grooming another young girl on the Bebo social media site, through a profile in which he posed as his seven-year-old son Sean.
In 2010 the Assembly debated the issue of a public inquiry into the case and agreed to call on the health minister "to seek to secure the agreement of the Secretary of State to initiate a time-bound public inquiry into the multi-agency aspects of the McElhill/McGovern tragedy in Omagh."
The call was supported by then West Tyrone MP and MLA Pat Doherty and the Northern Ireland Association of Social Workers, which said a public inquiry could prevent a similar tragedy.
However, the plan was shelved and a public inquiry has never taken place.
A spokeswoman for the Department of Health said: "There has been no change to the decision made in 2010 when it was considered a public inquiry would not reveal any additional information about social services involvement in the case.
"The role played by social services in the case was the subject of a thorough independent review and a follow-up review, which considered implementation of the original review recommendations."
In 2013, Kevin McGovern, Lorraine's father, lodged papers in the High Court claiming damages for alleged negligence in the supervision and monitoring of Arthur McElhill.
Proceedings were issued against the Western Trust and the PSNI, but neither body was able to confirm whether the case has concluded.
The PSNI did not respond to a request for comment, while a spokeswoman for the Western Trust said: "Respecting privacy we do not comment on any individual family matters."
