Police say only one person was in the car which crashed off a bridge just south of Twizel yesterday.
The car went through a bridge barrier on State Highway 8 south of Twizel just before 7am.
The body of the 29-year-old driver was recovered from the water near Ōhau B Canal Bridgeon Sunday evening.
Police are wanting to speak with anyone who may have witnessed the crash.
Witnesses can call the 105 phone service or provide information online using Update My Report and the reference file number 230115/5559.