The envoy, Andrey G. Karlov, was shot from behind and immediately fell to the floor while speaking at an exhibition [at] the Contemporary Arts Center in the Cankaya area of Ankara.
The gunman, wearing a dark suit and tie, was seen in video footage of the assault shouting in Arabic: “God is great! Those who pledged allegiance to Muhammad for jihad. God is great!”
December 19, 2016
"Russia’s ambassador to Turkey was assassinated at an Ankara art exhibit on Monday evening by a lone Turkish gunman shouting 'God is great!' and 'don’t forget Aleppo, don’t forget Syria!'..."
"The assassination... came after days of protests by Turks angry over Russia’s support for Syria’s government in the conflict and the Russian role in the killings and destruction in Aleppo, the northern Syrian city."