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Investigators are working to find out how a Suzuki Vitara left a motorway carriageway and landed on its roof, leaving a man dead and a woman injured.
Police say there were no other vehicles involved in the crash, which happened between junction 8 (Hollingbourne) and junction 9 (Ashford) at around 7.15am on Sunday, March 21.
The 32-year old man the 19-year-old woman - who was taken to William Harvey Hospital with a minor head injury - were both from Ashford.
Both carriageways of the motorway were closed and later reopened.
Kent Police's Serious Collision Investigation Unit are appealing for anyone who saw the incident to contact the witness appeal line on 01622 798538.