On May 2 1 Sunday 2 1, Dongning Public Security 1 10 Command Center and Suiyang Border Police Station received an alarm of casualties nearby. Yan Zizhong, deputy mayor and director of Mudanjiang Public Security Bureau, led important officials such as deputy director of Mudanjiang Public Security Bureau and director building of Dongning Public Security Bureau to urgently study the detection scheme and specific measures, and sent experts to the scene to carry out the case detection work overnight. After investigation, the suspect in this murder case is a 40-year-old man named Liu. The suspect Liu was retaliated because of his disagreement with his wife. That night, he went to Room 403, Unit 3, Yihe Jiayuan Community, Suiyang Town, and chopped his brother-in-law wife Hu with a knife and stabbed his daughter Jiang Moumou to death. Liu Moumou went to the Laosi Health Center in Suiyang Town, stabbed his classmate Gong Moumou to death, stabbed his 9-year-old son to death, and threatened to continue to retaliate against others.
On May 22nd and 4th, it was confirmed that the suspect Liu was hiding in a room of Suiyang Town Hotel. When the police entered the hotel to arrest, the gangster was extremely vicious and resisted arrest with a knife. After the police fired a warning shot, the police officer decisively shot and killed him on the spot.