A man has died of head injuries after a road rage dispute in central Christchurch two weeks ago.

Police are now appealing for witnesses to the dispute between two motorists on Harper Avenue, 100m from Carlton Corner, about 3pm on Monday, November 24.

Did you see the road rage incident? Email myles.hume@fairfaxmedia.co.nz

It is understood the man, in his 60s, sustained his fatal injury from a fall during the dispute.

Police said he was not assaulted.

The man was taken to hospital with head injuries and died shortly after midnight this morning.

An autopsy has been completed but police say inquiries into cause of death were continuing.

Police are seeking two men who were driving a dark people-mover and a sedan, but police would not say which vehicle the dead man was driving, nor if the other motoris had been spoken to.

Detective Inspector Greg Murton said police were investigating the circumstances which resulted in the man receiving the head injury.

He urged anyone who saw the dispute to contact police.

He said the serious crash Unit and CIB were working together on the investigation.

Information to Christchurch police 03-363 7670 or anonymously to Crimestoppers on 0800 555 111.