Robert McCartney, 33, was killed near Belfast city centre
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A 31-year-old man is being questioned by police in connection with the murder of Belfast man Robert McCartney.
It is understood the man was arrested after presenting himself at a police station with his solicitor.
Mr McCartney, 33, who was from the Short Strand area, was stabbed to death after a row in a bar near Belfast city centre on 30 January.
His family has blamed IRA members for the murder and subsequent interference with evidence and witnesses.
So far, police investigating the murder have arrested and questioned 12 men, all of whom were released without charge.
The IRA has expelled three members over the stabbing and Sinn Fein subsequently suspended seven of its members while the police investigation takes place.