Detectives of the Police Service of Northern Ireland's serious crime branch arrested a man today in connection with the murder of Robert McCartney seven years ago.
A spokesman said the man had been taken to Antrim serious crime suite for further questioning.
Mr McCartney - from the republican Short Strand area of Belfast - died after being beaten with metal bars and stabbed following an altercation in Magennis's Bar in Belfast in 2005.
Initial investigations were hobbled as police came under attack from rioters.
CCTV footage was destroyed before it could be looked at and Mr McCartney's sisters accused the IRA and Sinn Fein of obstructing the effort to bring his killers to justice.
They said potential witnesses had been intimidated - 71 people told family members they had been in the same four-by-three-foot toilet when the attack occurred.
Sinn Fein later suspended seven members over the murder and the IRA expelled three, but nobody has been convicted of it yet.
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