The local Coroner and office of the State Pathologist have been notified and a post-mortem examination has been arranged.
Results from the post-mortem will assist gardaí in determining the course of the investigation.
Investigating gardaí are appealing for witnesses to come forward. They are particularly appealing to those with video footage from the Ballinsheen Court area in the early hours of this morning to make it available to them.
Anyone with any information is asked to contact Anglesea Street Garda Station on 021 452 2000, the Garda Confidential Line on 1800 666 111, or any Garda Station.