Convicted Durban businessman Sifiso Zulu, reported at the Westville prison on Saturday, to start a three-year sentence for culpable homicide.
He was expected to report to prison on Friday, following the Pietermaritzburg High Court's dismissal of his appeal last week against his conviction and sentence for a road accident in March 2008.
42-year old Zulu, the former head of the Durban Chamber of Commerce, was convicted in April 2010.
The court found that Zulu, driving a BMW X5, had jumped a red robot and crashed into a bakkie, killing two members of the Souls Harbour Church and injuring eight others.
He was sentenced to five years in jail, two of which were suspended, and fined R7000 for various traffic offences.