Three people were arrested today in connection with the investigation into the murder of 24-year-old Lee Slattery, whose body was found in a shallow grave in Limerick in 2010.
Two men and a woman in their 30s were arrested this afternoon, gardaí said.
One man was arrested under Section 4 of the Criminal Justice Act, 1984, a second man was re-arrested under Section 51 of the Criminal Justice Act 2007 while a woman is detained under the provisions of Section 30 of the Offences Against the State Act 1939.
They are all being held at garda stations in the southern region.
Meanwhile, a woman in her 50s who was arrested yesterday in connection with the investigation has been released without charge.
A file will be prepared for the office of the director of public prosecutions.
There are currently five people in custody in relation to the investigation.
A man and a woman, both aged in their 30s, were also arrested yesterday afternoon.
Mr Slattery's body was discovered in Delmege House estate, near Moyross, in May 2010.
The 24-year-old had not been seen for four days after he visited a friend's house in the city on the night of 27 May 2010.
A post-mortem examination established that Mr Slattery had been shot a number of times before being buried.
To date, 31 arrests have been made in connection with the investigation.
Gardaí are appealing to anyone with information to contact Mayorstone Park Garda Station on 061-456980, the Garda Confidential Line at 1800 666 111, or any garda station.
