Why was King Nayong Song killed?

According to the accusation of Dafang County People's Procuratorate in Guizhou Province:

Due to an emotional dispute with Chen Jun, the king of Nayong folk songs, Sha learned that Chen Jun, the king of Nayong folk songs, would give an opening performance for the "Chameleon" Furniture City in Maochang Town on September 8, 2065 15, and rode a two-wheeled motorcycle to the performance place of Chen Jun, the king of Nayong folk songs. After the performance of Nayong Folk Song Jun, Sha changed his clothes with him, walked to the fork in the road opposite the "Convenience Service Center of Evergrande 20 Village", killed Nayong Folk Song Jun with a knife, chased Nayong Folk Song Jun for a while, stabbed him to death and left the scene. Appraised by Dafang County Public Security Judicial Appraisal Center, Nayong Mountain singer Chen Jun died of acute massive blood loss and hemopneumothorax when a sharp instrument pierced the pulmonary artery before his death. Sha surrendered himself to the Maochang Police Station of Dafang County Public Security Bureau on September 9, 20 18.