In a murder case involving post-mortem sexual mutilation of the victim's body, evidence of the accused's sexual interest in the deceased is relevant because such mutilation is to some limited extent explicable in terms of sexual preoccupation deriving from sexual interest, whereas if the killer had no sexual interest the mutilation would seem wholly inexplicable. The appellate standard for reviewing a trial judge's s 137 balancing requires the appellate court to be satisfied the trial judge was wrong, either on the basis of the reasons given or the unreasonableness of the result.
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