A man in his 50s has been arrested in connection with the collision - he's being held at Kildare Garda Station under Section 4 of the Criminal Justice Act.
It happened at around 8pm on Thomas Street in Newbridge last night where a woman in her 40s was found with serious injuries.
She was taken to Naas General Hospital where she was pronounced a short time later.
Gardaí say the results of a post-mortem will determine the course of the investigation.
Anyone with information to the incident or has dashcam footage are being asked to contact Newbridge Garda Station.
Significant Rail Disruption For Wicklow Passengers This Weekend
Simon Harris Commits to Four Years of Income Tax Relief
Education Minister Hails Coláiste Bhríde as 'True Community Hub' for South Wicklow
Bray Dip for Jigsaw Returns This Weekend
Criminal Legal Aid Certificates Tumble In Bray Following Introduction Of Legal Aid Scheme
