Four men have been arrested in connection with the murder of Lorcan O'Reilly.
The 21 year old was stabbed to death in the south inner city earlier this month.
He was trying to break up a fight at the Oliver Bond flats over the Halloween weekend when he was kniffed.
The attack happened in the early hours of the 1st of November and he was pronounced dead at St. James Hospital.
This morning 4 men have been arrested in connection with the killing.
All four are being detained at Kevin St, Kilmainham, Donnybrook and Sundrive Road Garda Stations.
Five people, 3 men and two women, were picked up on Monday.
They've all since been released without charge.
