http://www.malaysiakini.com/news/373576
Preliminary analysis from the Chemistry Department of Malaysia revealed that an extremely toxic chemical substance was used in the murder of Kim Jong-nam, the estranged half-brother of North Korean leader Kim Jong-un.

"The Royal Malaysian Police has received the preliminary report from the Chemistry Department of Malaysia, with regard to the death of a North Korean national recently.""The chemical substance on the exhibits has been identified as ethyl s-2-diisopropylaminoethyl methylphosphonothiolate, or 'VX nerve agent'...

http://www.malaysiakini.com/news/373612
Citing preliminary analysis from the Chemistry Department of Malaysia, inspector-general of police Khalid Abu Bakar said that the substance was identified as ethyl s-2-diisopropylaminoethyl methylphosphonothiolate or “VX nerve agent”.VX, Khalid had affirmed, is listed as a chemical weapon under Schedule 1 of the Chemical Weapons Convention Act 2005 and Chemical Weapons Convention (CWC) 1997.

http://www.malaysiakini.com/news/373603
The female suspects, detained in connection with the murder of Kim Jong-nam, had suffered adverse reactions due to handling the VX nerve agent without protective gear. In a text message to Malaysiakini, inspector-general of police Khalid Abu Bakar said the Indonesian woman suffered vomiting spells when riding in the taxi after the incident.

http://www.malaysiakini.com/news/373568
...The use of North Koreans based overseas has the hallmarks of an operation by elite spy training unit "Office 35", said Jang Jin-sung, a defector who had worked in the United Front Department of the Workers' Party, which along with Office 35, is an espionage unit within the ruling party.

"They produce people with real jobs and skills and send them abroad with family to live," said Jang. "When an urgent opportunity arises like this one on Kim Jong-nam, those people are tapped into operation, so they would be planted way before hand."