Mohamad Mat Yusop, Negeri Sembilan state police chief, told reporters Nora Quoirin died from "gastrointestinal bleeding" and she had suffered "extreme stress" and "hunger".
"For the time being, there is no suspicion of foul play," he told reporters after a post-mortem examination.
Malaysia uses recording of mother's voice in hunt for missing teen
She is believed to have died two to three days after disappearing, he said. "There is no indication she was raped," he added.
The 15-year-old's naked body was discovered Tuesday in a ravine in the dense jungle following a 10-day hunt involving hundreds of people.
She went missing from the Dusun Resort, not far from Kuala Lumpur, on August 4, a day after checking in for a holiday with her London based family.
Her family believed the teen, who had learning difficulties, had been abducted but police classified her disappearance as a missing person case.
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