Paul Joseph Dally snatched Karla, 13, as she cycled home from a dairy in the Hutt Valley suburb of Taita on May 26, 1989.
Her body - naked, bound, and gagged - was found that July beside the Pencarrow coast road.
She had a massive fracture to the back of her head and extensive bruising to her neck, throat, and vagina.
Police believe she had been tortured for at least 22 hours.
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