Republicans say the IRA was responsible for Mr Lynskey's death
The Independent Commission for the Location of Victims' Remains has confirmed it is investigating the death of west Belfast man Joe Lynskey.
Mr Lynskey, a former Cistercian monk from the Beechmount area, who later joined the IRA, went missing in 1972.
A spokesman for the commission said it was "satisfied the case of Joe Lynskey falls within its remit and has been added to the list of the Disappeared".
Republicans have claimed Mr Lynskey was "executed and buried" by the IRA.
Earlier this month, the Belfast Telegraph reported they had received confirmation that the IRA had carried out the killing in a briefing by a man who once "operated as the organisation's leadership spokesman".
It followed a report in the Irish News late last year in which a "senior republican source" claimed the IRA had killed Mr Lynskey following his disappearance in September 1972.
The commission was established in 1999 by treaty between the British and Irish governments.
Its purpose is to obtain information in strictest confidence which may lead to the location of the remains of "the Disappeared" - those killed and buried in secret by banned paramiltary groups prior to 10 April 1998 as a result of the Troubles.
The remains of five IRA victims have been found to date.