A fourth person has been arrested in connection with the latest gun attack in Dublin.
The victim, Stephen Byrne, was shot dead in the north inner city last Tuesday evening.
This latest arrest was made last night when gardaí detained a man in his mid 20s, bringing to four the number of people so far arrested in connection with the shooting.
Stephen Byrne was shot a number of times in the head and body near his home in Sheriff Street before 5pm last Tuesday.
The 32-year-old was standing on the corner near St Laurence's Church with three other people who ran off as the lone gunman approached. Gardaí believe the gunman arrived and left on a bicycle.
The death is the 17th gun murder so far this year.
Detectives believe the shooting is connected to an ongoing feud in the north inner-city.
The man arrested last night can be held and questioned for up to 72 hours.