On June 7, 2023, a criminal case occurred in Daguo Village, Chaohe Town, Wulian County. It is reported that the suspect Guo committed suicide after killing his wife, son and daughter with a knife in the context of family conflicts. The local public security organs quickly launched an investigation and successfully arrested the suspect Guo on the day of the incident. This series of actions enabled the case to be quickly detected. Relevant legal procedures will continue to ensure justice and bring just results to the victims and their families.