It has been a week since Kim Jong-nam, the half-brother of North Korean leader Kim Jong-un, was killed, but the exact cause of his death is still unknown.
Some forensic experts suspect the most old-fashioned of poisons, cyanide, in the crude assassination of Kim Jong-nam at Kuala Lumpur International Airport last week.
An initial post-mortem failed to identify the poison, but some experts cite the fact that Kim did not lose consciousness right after he was attacked and foamed at the mouth.
Kim was accosted by a woman at the airport who sprayed him with an unknown substance, but he was able to walk around for several minutes looking for help and explained the attack to airport staff.
Cyanide usually takes some 10 minutes to do its deadly work.
But cyanide is easily identified and distinguished by a heavy bitter-almond smell. Park Sung-hwan, a forensic specialist at Korea University, said, "If the toxin used was cyanide, it would be easily identified just by examining the stains on his shirt. Given that Malaysian authorities remain silent, there are high chances that some unknown poison was used."
Kim Yoo-hoon, a forensic expert, said, "In cases of poisoning, there are a dozen common toxins that are routinely tested for, including cyanide, carbamide and various alkaloids. It seems the toxin in question is not one of them."
Malaysian Health Minister Subramaniam Sathasivam said Monday that it will announce the autopsy results on Wednesday.
A still image from a CCTV footage appears to show a woman (circled) walking away after accosting Kim Jong-nam at Kuala Lumpur International Airport in Malaysia on Feb. 13, 2017. / Fuji TV