A man arrested by detectives investigating the kidnap and murder of Belfast mother-of-ten Jean McConville has been released unconditionally.
The 73-year-old man had been detained in Dunmurry in greater Belfast.
The abduction, killing and secret burial of Mrs McConville in 1972 is one of the most notorious crimes of the Troubles.
The police case lay effectively dormant for decades until a flurry of activity this year, with a series of arrests made, including the four-day detention of Sinn Féin President Gerry Adams.
Mr Adams, who vehemently denies involvement, was released pending a report being sent to prosecutors for assessment.
Mrs McConville was dragged away from her children in the Divis flats in west Belfast by a gang of up to 12 men and women after being wrongly accused of informing to the security forces.
She was interrogated, shot in the back of the head and then secretly buried - becoming one of the 'Disappeared' victims of the Troubles.
Her body was not found until 2003 on a beach in Co Louth, 80km from her home.