Mark Durkan has said the announcement Lord Carlile is to step down as terror laws watchdog will not affect his probe into a Londonderry man's murder.
Lord Carlile is to examine allegations that MI5 was involved in Kieran Doherty's death.
The 31-year-old was a member of the Real IRA and was murdered by the organisation in February. However, his family has alleged MI5 was involved.
Lord Carlile met the family in Derry earlier this month.
It was announced on Tuesday that he was to step down government's independent advisor on the activities of the security services
Mr Durkan said he had spoken to Lord Carlile earlier.
"This announcement is in respect of the role that Alex Carlile had as the independent reviewer of terrorism laws in the UK," he said.
"It is not in that capacity that Lord Carlile undertook his recent visit to Derry and his meeting with relatives of Kieran Doherty.
"He has a separate role reviewing national security arrangements in Northern Ireland.
"I understand from talking to Lord Carlile today that that separate role is not affected by today's announcement which was known to be coming having been signalled publicly and in parliament some time ago."