Four men assaulted a security guard repeatedly with metal pipes and folding stools for two weeks over a $6,700 debt, then dumped his body in a street in Hunghom after he succumbed to his injuries, the Court of First Instance heard yesterday. Lin Siu-lun, 33, Lau Ho-nam, 20, Cheng Sze-lok, 20, and Lau Cheuk-wah are jointly accused of murdering 27-year-old Wong Wai-hung on March 7 last year. Lin, Lau Ho-nam and Cheng Sze-lok have pleaded not guilty to the charge. Lau Cheuk-wah is not on trial. Lin is also accused, along with three men - Wong Chi-kwong, 27, Shit Chi-wo, 35, and Kwok Wai-tak, 26 - and two women, Ho Sau-ling, 17, and Cheng Chui-mei, 18, of conspiring to unlawfully dispose of the victim's corpse. They all deny the charge. Wong Chi-kwong and Shit have also pleaded not guilty to a joint charge of conspiring with Lin to attack Wong Wai-hung between February 15 and March 1 last year. Prosecutor Adrian Bell told the court that forensic pathologist Lai Sai-chak had concluded that Wong Wai-hung died of pneumonia and acute renal failure as a result of repeated physical abuse over a two to three-week period. Dr Lai had found bruises and wounds all over Wong Wai-hung's body, with 100 wounds alone to his back. While none was life-threatening, the doctor concluded the 'totality of the injuries taken in combination' caused his death. Mr Bell said Lin told police after his arrest that he took Wong Wai-hung, who owed him the money, to the home of Lau Cheuk-wah, who had 'spiked' his back 20 to 30 times with a knife handle, kicked him and bludgeoned him with a metal pipe. Lau Cheuk-wah, said Lin, had 'hammered' Wong Wai-hung's kneecap with a folding stool until the stool broke, then broke another stool beating Wong's back. On March 7 Wong Wai-hung died in Shit's flat. His body was dumped next to the Hunghom ferry pier the next morning, Mr Bell said. The trial continues today before Mr Justice Pang Kin-kee.