Police confirmed this morning that Daylin David Brown, 16, from Torrington died in the accident.
Daylin, was fatally injured when the Land Rover crashed outside Coombe Farm, which police described as being between Foxes Cross and Great Torrington.
On Saturday police said they believed only one vehicle, a Land Rover, was involved.
Today they said they wanted to speak with the driver of a small blue vehicle that was travelling on the unclassified road between Torrington and Alverdiscott between 3.30pm and 4pm on the day of the incident.
Anyone with any information is asked to contact police on 08452 777444 quoting police ref 594 050210.