Two people were released and the detention period of two others extended last tonight in the investigation into the weekend murder of Donna Cleary at a north Dublin house party.
A husband and wife were released last night without charge and a file has been sent to the DPP.
But two of the other five people held in connection with the murder of the 22-year-old mother had their periods of detention extended by 24 hours at a late sitting of Bridewell District Court.
The fifth man arrested on Sunday night in Co Kildare - Dwayne Foster (24) Woodbrook Avenue, Finglas - died in Garda custody yesterday. Gardaí regarded him as the chief suspect in the crime.
Post mortem results are due today but garda spokesman said it was not yet known if they would be publicly released. Judge James Paul McDonnell last night granted the Garda application to further question a man with a Clonee, Dublin 15 address.
The court heard from Superintendent Noel McLaughlin, who is leading the investigation, who said the extra time to question the suspect was needed to allow for access to technical reports on ballistics, DNA and a forensic examination of a car.
"From my inquiries, I have been led to believe that he played a central role in the shooting that took place," he said.
The suspect is being questioned in connection with the alleged possession of a firearm, the alleged possession of a firearm with intent to endanger life and his alleged involvement in the murder of Ms Cleary.
An extended period of detention was also granted for the questioning of man with an address in Finglas, Dublin 11.
He is also being questioned in connection with the unlawful possession of a firearm, the possession of a firearm with intent to endanger life and the murder of Ms Cleary.
Mr McLoughlin told the late court sitting that the suspect had failed to cooperate with garda questioning and added: "I believe he has played a critical role in the shooting and was named by witnesses as being present at the scene."