Guo Zhongmin was born on June 24, 1966, in the People's Republic of China. 

Guo Zhongmin committed a mass murder on February 18, 2003, in Yangxiaoxiang, Huludao, China. The attack resulted in the deaths of 13 people. Guo was involved in a land dispute with three of his neighbors. In response, he armed himself with a knife and a stick and went to their homes.

During the attack, Guo entered the houses of his neighbors and fatally stabbed or beat the victims. They included members of the Liu family, such as Liu Changrui, Liu Changyu, and their children and grandchildren. He also killed his cousin, Guo Zhongren, and several other family members of both families.

After the attack, Guo fled and hid in the nearby mountains. This sparked a large manhunt that involved over 1,000 police officers looking for him. On February 23, 2003, Guo was surrounded by police in Yejiajia, Suizhong County. Faced with capture, he chose to commit suicide by swallowing pesticide.