The Supreme People's Procuratorate (SPP) announced Sunday that will investigate a case which caught media and public attention over the weekend.
On April 14, 2016, more than 10 people went to Su Yinxia's company in Guanxian County in east China's Shandong Province to collect payment for loan sharks allegedly by means of insulting Su and her son Yu Huan.
Police arrived at the scene but Yu later stabbed four of the debt collectors including Du Zhihao, who died the next morning.
Yu was sentenced to life in prison by the Intermediate People's Court of Liaocheng, Shandong, on Feb. 17.
Investigators will examine and review the evidence to determine whether Yu was acting in self-defence, the SPP said in a statement.
The SPP will also investigate possible dereliction of duty by the police officers concerned.
The Higher People's Court in Shandong announced Sunday that it has accepted Yu's appeal.
