A 56-year-old man arrested in connection with the abduction and murder of Jean McConville in 1972 has been released pending a police report being sent to prosecutors.
Northern Ireland's Public Prosecution Service will now decide at a later date if there are sufficient grounds to charge the suspect.
He had originally been detained by officers last month but the interview process was halted due to a medical issue arising.
He was arrested again this morning after presenting himself at Antrim police station.
Mrs McConville was dragged from her children in the Divis flats in west Belfast by a gang of up to 12 men and women after being accused of informing to the British army.
She was interrogated, shot in the back of the head and then secretly buried.
Her body was found on a beach in Co Louth in 2003.
Seven people have been detained and questioned in the last two months in connection with Mrs McConville's murder.
Sinn Féin president Gerry Adams was released on Sunday without charge after four days in police custody.
A police file is to be passed to prosecutors to determine whether any charges will be pursued.
Mr Adams vehemently denies any involvement in the crime.
In March veteran republican Ivor Bell, 77, was charged with aiding and abetting the murder and IRA membership.
Police are preparing files on four women also detained in connection with the murder for Northern Ireland's Public Prosecution Service.