A third man has been arrested by gardaí investigating the murder of suspected drug dealer Darren Falsey in Co Cork earlier this year.
A man in his early 20s was arrested in the Carrigaline area this morning, a Garda statement said.
He is currently detained at the Bridewell Garda station Cork under Section 50 of the Criminal Justice Act 2007.
Two men arrested last night in the inquiry are still in custody.
Detectives arrested a 29-year-old man and a 20-year-old man at separate addresses in Carrigaline shortly after 7am yesterday.
Mr Falsey was shot dead when he answered the door at his rented house at Ashbourne Court, Ferney Road, Carrigaline, shortly after returning home at about 2pm on August 3rd.
The two men arrested yesterday were detained under section 50 of the Criminal Justice Act, which allows gardaí to hold suspects for up to five days.
The 29-year-old man was taken to Togher Garda station for questioning while the 20-year-old was detained at Mayfield Garda station.
Yesterday's arrests, the first in the investigation, came two weeks after gardaí confirmed that a gun recovered by gardaí during a search in north Cork was used to shoot Mr Falsey.
The arrests follow extensive re-examination by detectives over the past few weeks of CCTV footage from a number of commercial premises in the Carrigaline area on the day of the shooting.
Gardaí believe a sighting of a particular vehicle on CCTV footage from at least one commercial premises could prove of major assistance in their investigation, it is understood.
Initially, gardaí were investigating two main lines of inquiry into Mr Falsey's shooting – that he was shot by the Real IRA as part of a campaign of intimidation of and extortion from drug dealers or that he was shot by drug-dealing associates.
The Real IRA in Cork had already claimed responsibility for the murder of one convicted drug dealer, Gerard Staunton, in January 2010, and the shooting of another man, while a relative of Mr Falsey had previously been targeted by it as well.
However gardaí soon moved the focus of their investigation to the possibility that Mr Falsey may have been shot by drug associates, including the possibility that he may have been killed because he failed to pay a drug debt to one of his suppliers.
More recently, gardaí have shifted the focus of their investigation to the belief that Mr Falsey may have been shot by one of his customers who owed him money and that the man decided to kill him rather than pay the drugs debt.
It is understood the 29-year-old man would have known Mr Falsey and, when previously spoken to by gardaí as part of their preliminary inquiries, provided them with an alibi for the day of the killing.
It is believed the 20-year-old man works with the older man and provided him with the alibi but that gardaí were anxious to question the man closely about the alibi after re-examining CCTV footage from Carrigaline on the day of the killing.