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Kim Jong-nam, the half-brother of North Korean leader Kim Jong Un, was assassinated using VX nerve agent in Kuala Lumpur, Malaysia.

Related Wikipedia articles
Kim Jong-nam
Son of Kim Jong Il (1971–2017)
Kim Jong-nam was the eldest son of North Korean leader Kim Jong Il. From roughly 1994 to 2001, he was considered the heir apparent to his father. He was thought to have fallen out of favor after embarrassing the regime in 2001 with a failed attempt to visit Tokyo Disneyland with…Source: Wikipedia (CC BY-SA)
Kim Jong Un
Leader of North Korea since 2011
Kim Jong Un is a North Korean politician and dictator who has served as supreme leader of North Korea since 2011 and general secretary of the Workers' Party of Korea (WPK) since 2012. He is the third son of Kim Jong Il, who was the second supreme leader, and a grandson of Kim Il…Source: Wikipedia (CC BY-SA)
Assassination of Kim Jong-nam
2017 murder in Malaysia
On 13 February 2017, Kim Jong-nam, the older half-brother of the North Korean leader Kim Jong Un, was assassinated at the Kuala Lumpur International Airport in Malaysia. He had been living abroad since his exile from North Korea in 2003.Source: Wikipedia (CC BY-SA)
VX (nerve agent)
Chemical compound and chemical warfare nerve agent
VX is an extremely toxic synthetic chemical compound in the organophosphorus class, specifically, a thiophosphonate. In the class of nerve agents, it was developed for military use in chemical warfare after translation of earlier discoveries of organophosphate toxicity in…Source: Wikipedia (CC BY-SA)