A heroin addict chopped his live-in girlfriend's mother to death 21/2 years ago after she refused to lend him money to buy drugs, the Court of First Instance heard yesterday. Lee Wai-man, 29, went on to kill his girlfriend's seven-year-old stepbrother, dragging him from the bedroom to the kitchen with a television aerial wrapped around his neck. He was afraid the boy would testify against him, the jury heard. Lee has pleaded not guilty to two counts of murder. But the prosecutor said Lee confessed to both killings to police soon after he was arrested. He is accused of killing Anan Voranuch, 47, and Desmond Tong Tat-man in their house in Yuen Long on November 21, 2002. Thailand-born Voranuch, also known as Mrs Tong, moved to Hong Kong in 1982 and was fluent in Cantonese. The seven-year-old was Voranuch's son from a second marriage. The child and his parents lived together in a three-storey house at Tan Kwai Garden in Yuen Long. Lee began dating Voranuch's daughter, Tsang Wai-chu, in 1998. Ms Tsang, now 24, is one of Voranuch's three children from her first marriage. Lee and Ms Tsang had been living together at another address when the double murder took place. Prosecutor Richard Donald told the jury yesterday that Lee had borrowed money from Voranuch to buy drugs on several occasions. He also said that Lee occasionally accompanied his girlfriend to her mother's home for meals. He said Lee went alone to Voranuch's Yuen Long house for dinner on the evening of November 20, 2002, when her husband was away. Mr Donald said Lee had asked Voranuch to lend him more money, but she had refused. The court was told that when Voranuch went to the kitchen after taking a bath, Lee chopped her to death. Lee then went up to the third floor of the house, where Desmond was asleep in his bed. He wound a television aerial around the boy's neck and dragged him downstairs into the kitchen on the ground floor, where he chopped him in the neck with a chopper, the prosecution said. The bodies of Voranuch and Desmond were discovered five days later, after a neighbour complained of a bad smell and a large number of flies coming from Voranuch's house. Police broke into the house and found the bodies of Voranuch and Desmond. An autopsy determined Voranuch had suffered multiple cuts and stab wounds, while her son had cut wounds on his neck. Lee became a suspect because he was seen by the neighbour, Ng Wai-chun, going in and out of the Voranuch's house a few times. With help from the suspect's girlfriend, police arrested Lee a day after the bodies were discovered. The trial continues today before Mr Justice Gareth Lugar-Mawson.