He died later in hospital.
Today it was revealed a woman in her 20s had been interviewed by officers and a vehicle had been recovered.
Inspector Paul Bennett, from the Collision Investigation Unit, said: "Specialist officers continue to support the family at this sad time as we continue to piece together what happened that night.
"What I am appealing for now is for anyone who was in the area at the time to come forward. I understand that it was in the early hours of the morning but the road runs off the very busy A5 and someone may have seen Jamey walking home or any vehicles in the area.
"If you saw something but thought it was insignificant then please call me or one of my team so we can take some details."
Anyone with any information should call the Collision Investigation Unit on 101 or Crimestoppers the independent charity, on 0800 555 111.