- Watch Sara Moore's report:
The sister of one of the Disappeared has begged those who know where her brother Columba McVeigh is to tell them.
The 19-year-old was murdered by the IRA in 1975 and his remains have never been found.
He is one of three Disappeared victims who are still missing and his sister Dympna Kerr said not a day goes by when she doesn't think about him.
"It's the fact he hasn't been given a Christian burial and put in a grave beside mum and dad, that's the hard bit," she told UTV.
"Somebody out there has that bit of information and knows where Columba's remains are, and they're not willing to come forward."
The eleventh annual silent walk for the Disappeared was held on Thursday, with relatives gathering at Parliament Buildings.
They laid a black wreath with three white lilies representing those who have yet to be found.
Anne Morgan, whose brother Seamus Ruddy was found buried in woodland in northern France earlier this year, said the relatives of the Disappeared would stand together until they were all brought home.
She added: "We urge those who can help find them - Columba McVeigh, Joe Lynskey and Robert Nairac - to come forward and give proper information."