Seconds after a gunman killed Russian diplomat Andrei Karlov at an art gallery in Turkey yesterday, an AP photographer took a photograph that went viral. The photo shows the assassin with a gun in one hand, and the other hand pointed to the ceiling. He’s wearing a well-cut suit and he’s yelling. The dead body of Karlov lies at his feet. It gave many photo editors pause as they decided what to post on their websites about the assassination.