Speed is likely to have been a factor in Monday night's fatal crash on Dunedin's Southern Motorway, police say.
The death brought the Easter road toll to four.
A police spokeswoman on Monday night said the sole occupant of the vehicle in the crash had been critically injured.
In an update yesterday morning, police confirmed the driver had died at the scene.
Acting Sergeant Rhys Davidson said speed appeared to have been a contributing factor.