A man has died after a serious crash near Nelson this morning.

A car crashed into a tree on the Coastal Highway in Redwood Valley about 7.40am.

A 32-year-old Nelson man was trapped in the car and was taken to hospital in a critical condition once firefighters freed him.

He has since died.

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Another occupant was injured in the crash.

The Coastal Highway between Maisey Rd and Redwood Rd was closed for a time but has since been reopened.

Police are investigating the cause of the crash.