Police were called to reports of a two-vehicle collision at around 10 am on Tuesday 9 July.
The incident happened on the A39 at Beccott Cross, near Arlington, Barnstaple and involved a blue Rover 25 and a black Land Rover Freelander.
The driver and front-seat passenger of the Rover were taken to North Devon District Hospital by land ambulance.
Police have since been informed that sadly, as a result of injuries sustained in the collision, the 77-year-old driver of the Rover died in hospital on Monday 15 July.
The driver of the Land Rover was uninjured.
Anyone who witnessed the incident and anyone with information is asked to contact police on 101 quoting log 242 of 9 July.