The granddaughter of a German industrialist who was abducted, murdered and secretly buried by the IRA 50 years ago has planted a tree at the spot where his body was found.
The German ambassador to Ireland, Cord Meier-Klodt, was also among those who gathered on a Belfast hillside to mark the anniversary of the kidnap of Thomas Niedermayer.
Mr Niedermayer's granddaughter, Tanya Williams-Powell, also laid flowers and spoke briefly during a simple commemoration in Colin Glen Forest.
Watch:
Face Down: The Disappearance of Thomas Neidermayer
Thomas Niedermayer was snatched from his home in west Belfast in 1973.
He was the honorary German consul to Northern Ireland.
The plan was to swap him to secure the repatriation of the two IRA bombers from a British jail.
But he was killed by his captors when he tried to escape shortly after he was taken.
He was struck on the head with a pistol and died in the house where he was being held.
He was secretly buried in a dump nearby and his body was only found in 1980 when information was passed to the RUC.
Mr Niedermayer's widow, Ingeborg, returned to Ireland a decade later and took her own life in the sea at Bray, Co Wicklow - resort she'd visited with her husband.
Their daughter, Gabrielle, also took her own life in the years after the murder as did Gabrielle's husband, Robin.
They were Tanya's parents.
The Niedermayer's other daughter, Renate, also died prematurely - something the family put down to the trauma she and the others suffered.
The two daughters had been in the house the night their father was abducted.
Read more:
Face Down: the Disappearance of Thomas Niedermayer
A Knock on the Door: Thomas Niedermeyer kidnapping
British withheld information on Niedermayer kidnapping - UK state papers
"It's that multi-generational trauma that has come from that one incident that knock on the door, and the kidnapping of Thomas...that has been a key pivotal role in the tragedies that happened to our family.
"My sister and I are determined that that is not going to continue, and the legacy stops here, and our children will lead long happy lives informed by the past, not led by it," Tanya said.
Two men were subsequently jailed for their role in the killing.
The police mounted an elaborate undercover operation to facilitate the search for Mr Niedermayer's body in west Belfast.
They set up a bogus environmental group and claimed to be engaged in a clean-up operation at the site where they'd been told the body had been buried.
They found Mr Niedermayer after several weeks of searching.
The story is the focus of an RTÉ documentary "Face Down" which aired in recently.
