Detectives in Kuala Lumpur are trying to get to the bottom of the cloak-and-dagger murder that South Korea says was carried out by poison-wielding female agents working for their secretive northern neighbour.
Forensic specialists were today carrying out tests on samples from the dead man's body to try to determine the toxin that was apparently sprayed in his face as he readied to board a plane earlier this week.
North Korean diplomats have objected to the post-mortem examination, Malaysian officials say, but Kuala Lumpur has stood firm, and said today it would not release the body until procedures were complete.
"So far no family member or next of kin has come to identify or claim the body. We need a DNA sample of a family member to match the profile of the dead person," Selangor state police chief Abdul Samah Mat told AFP.
"North Korea has submitted a request to claim the body, but before we release the body we have to identify who the body belongs to," he added.
DNA from a child, sibling -- or even half-sibling -- would be enough to provide a "kinship match" and confirm the identity, a Malaysian forensic investigator told AFP.
Laboratory technicians working on blood and tissue samples from the autopsy would conduct tests "as soon as possible" to determine the cause of death, Dr Cornelia Charito Siricord of the science ministry's chemistry department told national news agency Bernama.
Police were meanwhile questioning two women -- one travelling on a Vietnamese passport and the other on an Indonesian document -- as well as a Malaysian man.
The drama erupted on Monday morning as Jong-Nam, the estranged elder brother of Kim Jong-Un, readied to board a plane to Macau.
Malaysian police say the chubby 45-year-old was jumped by two women who squirted some kind of liquid in his face.
Jong-Nam told staff he was suffering from a headache and was taken to the airport clinic grimacing in pain, according to Malaysian media citing CCTV footage from the airport.
One of the women walked to a taxi rank immediately after the attack, according to the same footage.
He was rushed to hospital suffering from a seizure but was dead before he arrived.
South Korea has pointed the finger of blame at the North, citing a "standing order" from Jong-Un to kill his sibling and a failed assassination bid in 2012 after he criticised the regime.
Pyongyang has made no comment on the killing, and there has been no mention of it in North Korean media.