Deirdre Jacob has been missing since 1998.
The father of Deirdre Jacob, who went missing from Newbridge, Co Kildare more than twenty years ago, has appealed again for anyone with information to come forward.
Jacob, who was 18 at the time, was last seen outside her home in the Roseberry area of Newbridge at 3pm on Friday 28 July 1998.
Speaking to Ray D'arcy on RTÉ Radio 1 today, Michael Jacob said: "These people are 20 years older and maybe much more mature and can look at things in a different light."
"The main thing to do is consider what the right thing to do is. We all probably bottle up things, but in this case the right thing to do is to come forward and give that information to the Gardaí."
Mr Jacob said any information, large or small, may help with solving the case. "I describe this investigation as a giant jigsaw with pieces scattered around and it will only become clear when those pieces are put together".
The missing persons case was featured on an episode of Prime Time last week, and Jacob's father has said that the Gardaí have received many calls from people trying to help following the broadcast of enhanced CCTV footage.
"There has been a very good reaction to the programme," Mr Jacob said.
Anyone with information on the case is urged to contact the Garda Confidential Line on 1800 666 111 or can reach detectives in Kildare on 045-521222
