Kim Jong-nam 'killed by VX nerve agent found on his face' Kim Jong-nam, the half-brother of North Korea's leader, was killed by a highly toxic nerve agent, says Malaysia. Mr Kim died last week after two women wiped a substance over his face in a check-in hall at Kuala Lumpur airport. Malaysian toxicology reports have identified the chemical as "VX nerve agent", classified as a weapon of mass destruction by the United Nations.