Where the cause of death is unknown in a murder prosecution, the prosecution cannot prove beyond reasonable doubt that the deceased was killed by an act done with intent to kill or cause grievous bodily harm, even where the evidence supports a finding that the deceased was killed by the infliction of violence. It is not a pre-condition to the exercise of the s 668F(2) verdict substitution power that every fact found by the jury be known; the power may be exercised where the unreasonableness of the murder verdict depends only on the absence of proof of intent, with all other elements being open to the jury to find as established. The proviso cannot be applied where the appellate court has not seen or heard the evidence and there are grounds for challenging witness credibility.
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