Former South Australian attorney-general Michael Atkinson is keeping up a fight on behalf of the widow of a cyclist who was killed in a hit-run accident, north of Adelaide.

He is urging the Labor Caucus to force the MP who replaced him in the job to refer the case involving hit-run lawyer Eugene McGee to the Legal Practitioners Disciplinary Tribunal.

Mr McGee was fined for driving without due care for hitting and killing cyclist Ian Humphrey, eight years ago.

The current South Australian Attorney-General, John Rau, decided against referring the case to the tribunal for further consideration.

But Mr Atkinson thinks Mr Rau should take the case further, and has given a notice of motion to the Labor Caucus in an attempt to make Mr Rau refer the matter.

"My opinion is that John Rau should refer the Eugene McGee matter to the tribunal for adjudication but he has chosen in a personal decision, not a Cabinet decision or a Government decision but a personal decision, not the refer the Eugene McGee charge to the tribunal," he said.

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