A man killed when a car crashed into a tree in rural South Auckland over the weekend has been named by police.

He was 54-year-old Darin McKay from Auckland.

Emergency services were called to the crash on Clevedon-Kawakawa Rd about 3.45am on Saturday.

Mr McKay, who was a passenger in the car, died at the scene. The driver suffered serious injuries.

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The police serious crash unit was investigating the cause of the crash.