A 72-year-old old man has died in hospital after being injured in a car crash in the Christchurch suburb of Ilam last week.
Bruce Gardiner's car hit another vehicle on Creyke Road near Canterbury University about 3.45pm on 8 July.
A police spokesperson said on Tuesday that Mr Gardiner and a passenger were treated for injuries at the scene before being sent to hospital.
Although Mr Gardiner's injuries were moderate, post-mortem results show that he had pre-existing medical conditions that may have contributed to his death.
Police said other vehicle may have been doing a U-turn.