Duffy protesting at a homecoming parade for soldiers in Belfast
Colin Duffy is perhaps the most recognisable name and face among dissident republicans in Northern Ireland.
He used to be associated with Sinn Féin, but cut ties over its move towards power sharing at Northern Ireland's devolved assembly.
He was one of the first people arrested in connection with the murders of sappers Patrick Azimkar and Mark Quinsey in Antrim earlier this month.
This was in a dawn raid at his home in Lurgan, County Armagh.
On Thursday night supporters of Mr Duffy attended a meeting at a nearby community centre in the Kilwilkie estate.
At the meeting, Paul Duffy described his brother as an "unashamed republican" who has "always stood up for the people in this community and always will".
In 1990 he escaped injury in an attack in which a friend was shot dead by loyalists.
He had until February of this year been associated with eirigi, a political group opposed to Sinn Féin's involvement in Northern Ireland's power-sharing executive.
He was photographed with other members of the group, protesting against a homecoming parade in Belfast for soldiers returning from service in Afghanistan and Iraq.
Mr Duffy's solicitor, Rosemary Nelson, was murdered by loyalists in 1999.
She was killed in a booby trap car bomb attack outside her Lurgan home.
The murder is now subject to an ongoing inquiry at which it has been alleged that there was security force involvement in the killing.