The killing of a transport worker at Yau Ma Tei wholesale fruit market in July last year was preceded by a dispute between two groups of workers there, a court heard yesterday. Chung Hung-chai, 40, a transport worker, faced the first day of a jury trial at the Court of First Instance on a charge of murdering Chan Wing-kin, 39. Chung pleaded not guilty. Chung allegedly struck Chan in the chest and abdomen with a machete, exposing his heart and lung, and cutting his left ventricle, on July 22 last year. Chan died from massive blood loss. Before his death, two groups of workers at the market had had a dispute about the loading and unloading of goods, prosecutor Deb Crebbin said yesterday when opening the case. A day or two before Chan's death, a porter who worked with Chan had been injured, Crebbin said. Then, on the evening of Chan's death, the groups tried to settle the dispute. During an argument, Chan and others assaulted Chung with fists. Many of Chan's group then arrived with knives. Chan returned to his office nearby. Another worker tried to warn him not to go out, but he did. 'Once [Chan] walked out, the whole group rushed out. Four or five were holding weapons. None of us carried weapons,' said Lam Tsz-kit, who was with Chan when the attack occurred, as he testified in court. Chung had an exchange with someone else in his group. Suddenly, he struck at Chan's chest with the machete, said Lam, who also suffered a wound requiring five stitches to his waist and one requiring three stitches on his right hand in the scuffle. Chung told police after his arrest that he had not intended to kill or seriously injure Chan, Crebbin said. 'He thought of sliding the knife down the deceased gently to teach him a lesson,' she said. He had been angered by the earlier assault and did not want to lose face with his workmates. However, the prosecutor said, by striking at Chan's chest with his machete in a sweeping motion, with enough force to expose the heart and lung, Chung must have at least intended to cause a very severe injury, even if not enough to kill. The trial continues before Mr Justice Michael McMahon.