Emergency services were called on 7 August 2017 to a collision between a Vauxhall Zafira and a Scania tipper lorry at North Molton junction near South Molton.
Mr John Pope, the driver of the Vauxhall Zafira, sustained life-threatening chest and head injuries and was taken to North Devon District Hospital.
Police have been notified that Mr Pope died on 10 January in Worcestershire as a result of the injuries caused in the collision.
Devon and Cornwall Police are now investigating the A361 incident as a fatal collision and a file will be prepared for the coroner.
Anyone with information is asked to contact police on email@example.com or by phone on 101, quoting log number 294 of 7 August 2017.