No person shall suffer death for murder, and a person convicted of murder shall F1. . . be sentenced to imprisonment for life.

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For the purpose of any proceedings on or subsequent to a person’s trial on a charge of capital murder, that charge and any plea or finding of guilty of capital murder shall be treated as being or having been a charge, or a plea or finding of guilty, of murder only; and if at the commencement of this Act a person is under sentence of death for murder, the sentence shall have effect as a sentence of imprisonment for life.

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