He was taken to the airport clinic and then died on the way to the hospital, the official said.

In 2012, a North Korean spy admitted he had been ordered by the secretive state to attack Kim.

He was embarrassingly detained at a Tokyo airport, trying to enter Japan to visit Disneyland on a false Dominican Republic passport, accompanied by two women and a child. Since 2003, he had been living in exile in Malaysia, Singapore and Macau till his death.

Police earlier told Reuters that an unidentified man had died en route to the hospital from Kuala Lumpur Airport.

"His identity and cause of death have yet to be ascertained".

Officially, Beijing has voiced support for the North Korean succession.

Kim Jong-Nam was once tipped to become the next Supreme leader of North Korea but instead, was rocketed to worldwide headlines after South Korean media reported that he had been killed in Malaysia in 2017.

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Speculation quickly spread in South Korea on Tuesday that Kim Jong Un might be behind the reported death of his half brother.

Did Kim Jong-un kill his brother? Jong Nam was supposedly there to collect payment for an worldwide weapons shipment, but told the press he wanted to take his family to see Disneyland-a statement they dutifully repeated with full credulity.

South Korea's Foreign Ministry said it could not confirm the reports, and the country's intelligence agency could not be reached for comment by Reuters. The major holiday this Thursday is called the "Day of the Shining Star" and will be feted with figure skating and synchronized swimming exhibitions, fireworks and mass rallies.

The same year, Kim Han Sol sat down with former Finnish member of parliament Elisabeth Rehn to discuss his life and his unusual family for a televised interview.

Kim Jong Nam was pronounced dead en route toa [sic] nearby hospital, Mr. Abdul Samah said, adding that an autopsy is now under way.

Jong-Nam, who was travelling alone, had at 9am told airport staff at a reception desk that he felt "dizzy" after an unknown person had swabbed his face with an unknown object. The report cited several South Korean government sources.

He was known to travel to Hong Kong, Macau, and mainland China. She has not been seen in public for more than three years, Gause said. He was born from his father's nonmarital relationship with Sung Hae-rim, a South Korean-born actress who died in Moscow. But in a New Year's speech, Kim Jong Un said he had "spent the past year feeling anxious and remorseful for the lack of my ability", painting himself as tough on enemies but humble before the people. The South's government has said the North also executed a vice premier for education in 2016 for unspecified anti-revolutionary and factional acts, and a defense minister in 2015 for treason. But if true, the latest reports would mark another surprising development in the tales of North Korea's leadership.