Yonhap news said Kim Jong-nam, who is believed to be in his 40s, was killed on Monday morning in Kuala Lumpur.
Quoting government sources, other media reports claim Mr Kim died after being jabbed by a poisoned needle by two women in the city’s airport.
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The women are believed to be North Korean agents but have so far been able to evade a police hunt.
Police in Malaysia told Reuters that an unidentified North Korean man had died en route to hospital from Kuala Lumpur airport on Monday.
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