A forensic pathologist's concession of a theoretical scientific possibility that an alternative cause of death cannot be excluded does not preclude a jury from being satisfied beyond reasonable doubt of causation, where the pathologist considers the alternative cause unlikely and the evidence as a whole supports the prosecution case. Admissions by an accused that he 'punched someone and they died' are not equivocal as to the accused's role as principal offender merely because they do not expressly distinguish between liability as principal and liability as party under s 7 of the Criminal Code (Qld).
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