A killer who murdered two young lovers cried out to his weeping family yesterday as he was jailed for life. 'Mother, I won't see you anymore,' Cheung Moon-keung, 30, shouted as he was dragged away. 'My brother is innocent,' Cheung's sister sobbed as she promised to launch an appeal. A High Court jury convicted the goldsmith of murder, robbery and preventing the proper burial of his victims. Yung Tze-lung, 21, and his 16-year-old sweetheart Chan Chin-yee disappeared in September 1995. Their bodies were discovered five months later, dumped in a pit on a Lantau hillside. Both had been bound, blindfolded and gagged, and their heads had been smashed open. Cheung blamed the killings on alleged co-conspirator Lo Yau-fuk, 28. The victims had been lured to a holiday home in Mui Wo where Cheung, Lo and a third man named Lam Chung had allegedly hatched a robbery plot. Cheung claimed Yung and Chan were ordered to lie down and were stripped of their wallets. He said Lo had bound and gagged the victims and then smashed the skulls of first Yung then Chan with a wooden stick. Although Cheung had admitted taking part in the robbery, he denied murder and preventing proper burial of the bodies. Neither Lo nor Lam was on trial with him.