North Korean Assassination: What Is VX Nerve Agent?

North Korean leader Kim Jong Il, , sits with his first-born son Kim Jong Nam, in this 1981 family photo in Pyongyang, North Korea. Kim Jong Nam was attacked by VX nerve agent on Feb. 13. Soon after having his face rubbed with a cloth by two women at the airport in Kuala Lumpur, Malaysia, the exiled North Korean complained of facial pain, had a seizure and died.