A police spokesperson said the death may have been the result of a medical event, rather than being caused by the crash.
Earlier today, police pleaded with drivers to take more responsibility after a lethal weekend on the country's roads.
Nine people died between Friday and the early hours of Monday morning, bringing the road toll to 292 for 2017, up 41 on the same time last year.
At least 10 others have been injured or seriously injured.
Assistant Commissioner Road Policing Sandra Venables says this weekend's fatalities will have left families devastated up and down the country.
"Every death is reported as a number, but each number has a face, a name and a family.
They leave behind loved ones whose lives have been changed forever.
"We cannot continue to tolerate the loss."
She said it was too early to give exact details of the causes of the weekend's crashes but speed, fatigue, losing control and crossing the centre-line were all factors.
"We have another long weekend coming up when traditionally more people will be out on the roads. Everybody needs to focus on getting to their destination and home again safely."