Police said they had arrested "another female suspect believed to be involved in the death of a Korean male on 13 February 2017" and named her as Siti Aishah, 25, of Serang, Indonesia.
"She was positively identified from the CCTV footage at the airport and was alone at the time of the arrest," a police statement said. It did not disclose the location of the arrest.
Police later said they had arrested Siti's boyfriend, 26-year-old Malaysian Muhammad Farid Bin Jalaluddin, "to assist in investigations" in the case.
Meanwhile, Deputy Prime Minister Ahmad Zahid Hamidi said Kim Jong-Nam's identity had been established by comparing the passport the dead man was carrying with documents provided by the North Korean embassy.
"His identity was confirmed from the passport that we compared with the document issued by the Embassy of North Korea and by the identity issued by the embassy," he was quoted as saying by Malaysian state news agency Bernama.
On Monday, a man carrying a North Korean passport with the name Kim Chol died en route to hospital after reportedly telling medical personnel that a woman had attacked him with a chemical spray.? That passport was authentic, Zahid said Thursday.
An autopsy on the body has been completed at Kuala Lumpur General Hospital but authorities have yet to announce the findings.
"For DNA confirmation, that will need time, let the police and the medical experts confirm this," Zahid was quoted as saying in a New Straits Times report, speaking to reporters in Putrajaya after a meeting with the National Chamber of Commerce and Industry of Malaysia.
The Korean man was at Kuala Lumpur International Airport 2 (KLIA2) on Monday, waiting to board a flight to Macau, when a woman suddenly approached and put a cloth over his face, police told reporters, citing CCTV footage. The suspect and a second woman then fled the scene.
On Wednesday, at KLIA2, police arrested a suspect identified in her travel documents as 28-year-old Doan Thi Huong of Vietnam.
Selangor state police chief Abdul Samah Mat told media that both female suspects had been remanded for a week to facilitate investigation.
Malaysian authorities were looking for at least three other male suspects.
Zahid told reporters that Kim's body would be released to the next-of-kin or the embassy after all the police and medical procedures have been completed.
"To date, no official request, but they probably channeled their request to the North Korean embassy," he said, referring to the victim's relatives.
Zahid said the death had not affected bilateral ties between North Korea and Malaysia, according to the Bernama report. He defended safety at airports in Malaysia and said this had been discussed at a cabinet meeting on Wednesday.
Malaysia is among a small list of countries with close relations with the communist regime in Pyongyang under global sanctions over its illegal nuclear weapons drives and ballistic missile launches, the latest of which took place at the weekend.
"Ahmad Zahid also gave an assurance on the safety at Malaysia's airports, including KL International Airport 2, saying it was at the highest level and that the death was an isolated case," Bernama reported.
"Ahmad Zahid said that at yesterday's Cabinet meeting, it was stressed that the government would protect visitors to the country and would not compromise on any security issue created by Malaysians or foreigners," the report said.
Reported by BenarNews, an RFA-affiliated online news service.
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