Last Monday, Jong-nam was reportedly at klia2 at about 8am to board a flight to Macau an hour later when a woman covered his face with a cloth laced with poison.
One of the female suspects had Vietnamese travel documents and was picked up Wednesday at the budget terminal of the airport, the same place where the attack took place.
Two employees of the help desk Kim Jong Nam approached declined to discuss the incident when asked by Reuters reporters, several people working at the Starbucks cafe said they had seen nothing unusual that morning, and the medical center's receptionist said she could not confirm that he had been brought into the clinic. Police said an autopsy was planned to determine the cause of death. Both women have been remanded in custody for seven days, according to police.
Inspector-General of Police Tan Sri Khalid Abu Bakar, in a statement, said a woman by the name of Siti Aishah and born Serang, Indonesia, on 11 February 1992 was arrested early today.
North Korea has made no comment on the killing, but its diplomats objected to an autopsy Malaysian investigators carried out, a senior official said.
Lawmakers in South Korea had on Wednesday cited their spy agency as saying it suspected two female North Korean agents had murdered Kim Jong-nam.
The disclosure of this news may have spurred Kim Jong-un to act. It is still unclear who attacked him or why, but according to Lee, it was two Asian women.
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A grainy image taken from security camera footage, which has been broadcast in South Korea and Malaysia, shows a woman wearing a white T-shirt with the letters "LOL" written on the front.
When Pyongyang protested the post-mortem examination, "we told them to follow Malaysia's laws", the official involved with the case told AFP.
The woman who was in possession of an Indonesian passport was arrested at around 2am on Thursday local time.
Even more damaging, Kyunghyang Shinmun's report quoted anonymous sources to report that Kim Jong-nam had attempted to defect to South Korea, the United States, and Europe - news that could seriously weaken the Kim dynasty's stature in the eyes of North Korea's elites and commoners.
Last week, a South Korean newspaper, The Kyunghyang Shinmun, reported that, during the 2000s, he had carried messages between President Park Geun-hye, who is now suspended amid impeachment proceedings, and then-leader Kim Jong-il - revelations that could threaten the North's official line that its leaders are the only legitimate ones on the Korean peninsula.
North Korea watchers say the past cases and the killing of Kim Jong-nam indicate that Kim Jong-un is as unpredictable and ruthless as his father and grandfather.
But some analysts question what motive Kim Jong-un would have to kill his estranged half-brother, given the risk of the operation and possibilities for embarrassment, added to the fact that he was not seen as a threat to Mr Kim's leadership.