Police have named a man killed in a crash near Fox Glacier on Friday night as the award-winning mathematician Charles Edward Miller Pearce.
Professor Pearce, 72, was travelling alone when his car hit the entrance of a single lane bridge and ended up in the Manakaiua River.
The accident was discovered by a passing motorist at about midnight and Professor Pearce was found dead at the scene.
A graduate of Victoria University, Professor Pearce has lived in Australia since 1962.
He was Elder Professor of Applied Mathematics at the University of Adelaide.
In 2001, he was awarded the Australian and New Zealand Industrial and Applied Mathematics Medal for his research, which includes theories on road traffic and telecommunications.