Gardaí are renewing their appeal for information about a serious assault that took place in Dublin earlier this month.
A man in his 40s suffered serious head injuries on the Phibsborough Road at around 7pm on October 7 and was taken to the Mater Hospital.
He was later transferred to Beaumont Hospital in a critical condition.
Gardaí want to speak to a man, who is understood to work in the medical profession, who came to the aid of the victim.
No arrests have been made.