Mr Bryant says any conviction on a murder charge would carry a sentence of lifeimprisonment or death, and that he will not agree to charge Mr Rideau with the lesser crime of manslaughter.
Facing public pressure, India's government in February proposed legislative changes that would increase the maximum punishment for convicted rapists to the death penalty from lifeimprisonmentand widen the definition of sexual assault.
He is the only person with the power to grant clemency to stay the execution and commute Williams' four death sentences to lifeimprisonment with no parole.
Although he was pardoned by the Truth and Reconciliation Commission for making a full disclosure, Nofemela had his death sentence converted to lifeimprisonment for murdering the farmer.