What's the name of the chef who was killed in China?

Yan is the father of two children. Last February, he killed three lawyers from two law firms in Dü sseldorf and Herkrath, and three others were injured. His method of killing is very cruel. Female lawyer stabbed 14 knife. Two law firms were also set on fire. During the trial, Yan Qing confessed that the red light of marriage made him lose confidence in life.