The man suffered catastrophic head injuries.
A man in his 30s who was assaulted in Dublin last Saturday has died.
The results of the post-mortem will determine the course of the investigation.
The man suffered catastrophic head injuries.
No arrests have been made, and Gardaí are appealing for witnesses to come forward.
Gardaí are specifically urging passengers who travelled on the number 13 Dublin Bus from Clondalkin between 9:00 pm and 10:00 last Saturday to come forward, especially those who disembarked at the bus stop on St. Cuthbert's Road and went towards Grange View Road.
They're also looking to speak to anyone who was in the Tower Road area of Clondalkin between 9:30 pm and 10:15 pm, or in the Grange View Way area between 10:00 pm and 10:30 pm.