YouTube star Christina Guimi was shot dead at a fan conference

CNN reported that the man with the gun walked up to 22-year-old Christina Guimi and opened fire. According to witnesses at the scene, the killer fired at least three shots before being caught by Christina Guimi's brother, who shot himself during the struggle. So we may never know the real cause of this tragedy. There are probably countless possible reasons, a boyfriend who was abandoned by his girlfriend or he was a crazy fan, or a victim of an online shooting violence game.

According to U.S. Justice Department statistics, an average of 3.4 million people in the U.S. are pestered each year, including through social media and emails of various undesirable content sent by the other party, and even take actual action to shoot victims.