CCTV footage seized during the original investigation into the death of Raonaid Murray 20 years ago is to be analysed by gardai.
The announcement came as gardai made a fresh appeal for information on the brutal murder of teenager Raonaid Murray, who was stabbed to death in 1999.
The murder of Raonaid is still unsolved two decades after the 17-year-old was stabbed to death just yards from her Dublin home, with no prime suspect or motives identified.
In a statement, gardai said that the investigation continues, with fortnightly conferences held in the incident room in Dun Laoghaire Garda Station. The matter has been reviewed by the serious crime review team with separate lines of enquiry, including a review of each of the suspects identified during the investigation.
"Nearly 200 suspects have been identified and examined during the course of the investigation resulting in a total of 14 arrests," gardai said.
They will also re-examine inquiries arising from nearly 5,000 questionnaires completed atcheckpoints and licensed premises and during house-to-house enquiries made in the course of the original investigation.
Gardai will also review all composite sketches and photofits linked to the case.
As Raonaid's heartbroken family marked the anniversary of her death, they called on her killer to "do the right thing and confess your crime".
The teenager was last seen at 11.20pm on Friday, September 3, 1999 on her way home from Dun Laoghaire town centre.
She was found dead just over an hour later in Silchester Crescent in Glenageary, less than 500 yards from her home.
Her father Jim Murray said: "Our beautiful child died on the pavement, with no loving, caring person there to help her, comfort her.
"Raonaid's killer is free. That freedom mocks what should have been Raonaid's life, and mocks the horror of her death.
"To her killer we say, come out from the shadows and own up to what you have done. Do the right thing and confess your crime," he said.
"To us, her awful death is still vivid in our minds and we feel the pain of her loss every day."
"We ask anyone who may have undisclosed information to come forward to the gardai," Mr Murray added.
"Help us find Raonaid's murderer. Time has not lessened our sense of grief and loss except it's deeper, and more profound. Raonaid died alone and frightened, her killer is free. For Raonaid's sake, help find her murderer and get her the justice she deserves."
Meanwhile, gardai said: "Many who were then Raonaid's age are now parents themselves with children, some of which would now be close to Raonaid's age, and we would ask them to reflect now with the benefit of maturity and hindsight on any information which may be of assistance to the investigation.
"If any person has any information which could assist in identifying a motive for the murder of Raonaid and/or if any person has any doubts about the veracity of an alibi already provided, we would appeal for your immediate assistance," the statement adds.
"You may be unknowingly shielding a killer."