A 26-year-old woman from Caerphilly has been arrested on suspicion of causing serious injury by dangerous driving.
The arrest follows the death of a pedestrian who was hit by a car on the A472 between Pontypool and Hafodyrynys on Friday December 19.
Mark David Burgham, aged 38 from the Abertillery area, died after suffering serious injuries when a Seat Ibiza hit him at around 11.10pm.
Gwent Police said the 26-year-old woman has been released on police bail pending further enquiries.