However Malaysian authorities have not made a decision on whether the body would eventually be handed over to North Korea.
Doan Thin Hoang, 28, is one of two women suspected in Monday's fatal poisoning of Kim Jong Nam at Malaysia's Kuala Lumpur International Airport.
Kim, who died on the way to a hospital, told medical workers that he had been attacked with a chemical spray, the official said. According to U.S. media, Washington officials said that Kim Jong Nam could be assassinated by Pyongyang's security agents. But the Malaysian official said the autopsy was still continuing.
Jong-nam, 45, died after he was attacked at the Kuala Lumpur International Airport 2 (KLIA2) on Monday.
Still photos of the video, confirmed as authentic by police, showed a woman in a skirt and long-sleeved white T-shirt with "LOL" across the front.
They were identified from CCTV footage in the airport before they fled in a taxi.
Mr Kim is the estranged older half-brother of North Korean leader Kim Jong Un.
South Korea's acting President and Prime Minister held a National Security Council meeting on Wednesday morning to discuss the death, according to a statement released by the Blue House.
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The NIS also cited a "genuine" attempt by North Korea to kill Kim Jong Nam in 2012, the lawmakers said.
The letter said: "I hope you cancel the order for the punishment of me and my family".
"Malaysia said it won't be pressured into anything. we will stick to procedures", a source told Reuters.
"Yes, nearly certainly", North Korea expert Van Jackson told Bloomberg.
It is not clear when he left North Korea, but Kim Jong Nam spent time living in Macau and China and was absent from his father's funeral in 2011, fueling earlier rumors that he had been banished from the country. Cars belonging to the North Korean Embassy were seen at the hospital.
Although there was scant evidence that Kim Jong Nam was plotting against the North Korean leader, he provided an alternative for North Koreans who would want to depose his brother. He had also once told a Japanese TV station that he was personally opposed to a third generation of Kims ruling North Korea. Mr Kim, who travelled widely, was known to use fake passports.
He was probably not viewed as a direct threat to his half brother, but as "an obstacle to Kim Jong Un's plan to maintain the regime for the next 20 to 30 years", the professor said. "Kim Jong-un could strengthen his grip on power in the short term, but it will weaken his power base in the long term and it could mark the beginning of the end of the regime".