Garda surveillance images obtained by the Sunday Independent show Gerry 'The Monk' Hutch and former Sinn Féin councillor Jonathan Dowdall in Donegal for a meeting with dissident republicans in the wake of the Regency Hotel attack.
The images were taken in taken on February 20, 2016 and were published for the first time at the weekend.
This would have been two weeks after the murder of Lieutenant David Byrne and show Hutch, outside the home of convicted IRA man Shane Rowan in Killygordon.
Unknown to the pair, the supposedly top secret meeting was being monitored by Gardaí.
Conversations between the pair at the meeting and on the way up to Donegal would form the key part of the State's case against Hutch for the murder of David Byrne.