Yan Yanming (Chinese: 闫彦明) (1983 – January 18, 2005) was a Chinese mass murderer who entered a dormitory at the Ruzhou Number Two High School in Ruzhou, China on November 26, 2004, with a knife and attacked twelve boys, killing nine of them.After the attack, Yanming ran away from the school, but was arrested hours later after he failed to commit suicide because his mother had reported his location to the Ruzhou police.After trial, Yanming was sentenced to death and executed on January 18, 2005 in Pingdingshan.