Wife's death an accident: alleged killer A QUEENSLAND man accused of murdering his wife says he accidentally killed her and then dissolved her body in acid to cover it up, a court has heard. Klaus Andres, 70, is on trial at the Supreme Court in Cairns for the murder of Li Ping Cao, 42, on October 30, 2011, at the couple's Cairns home. On Monday, Andres told the court the pair had been arguing about money and their relationship on October 30, 2011, when his wife stabbed his hand twice with a table fork. He pushed her "not with excessive force" in the chest and she fell onto the kitchen tiles, he says. I said: 'Get up, do you need my help? But there was no response," he said. Andres says his wife wasn't breathing and he couldn't find a pulse. He says he was in shock and went to dial 000, but put down the phone when he realised he might be blamed for her death. "I just thought: 'she's dead, no one can help her," he said. I was afraid of going through all of this that I'm going through now (the trial). He then lay on his bed and spent a sleepless night in the house with his dead wife. When he saw her body in the morning he thought: "Why has this happened to Li Ping? It's not fair. He then dumped her body in a wheelie bin and left it in the backyard. Andres says later that day he bought 20 litres of hydrochloric acid and poured it into the wheelie bin. He says he used the acid after he remembered a story he saw about the method on either SBS's Dateline or ABC's Foreign Correspondent - he doesn't recall which. He dumped his wife's clothes and told friends and family she had left him after they had an argument. Two days later he bought more acid and poured this into the wheelie bin. Andres also admits "completely" lying to police during their investigation. "I had to use one lie and then I had to use two lies to cover the first," he told the court. Andres says that on the night his wife died she accused him of using her for cleaning, cooking and sex. He told the court the couple had been unhappy for sometime. Andres said he paid for nearly all of the household expenses, encouraged her to make friends in Cairns and helped her to get a driver's licence. He admitted to having an affair with a Thai woman in the months leading up to his wife's death and said he wanted the woman to move to Australia. Andres, who moved to Australia from Germany in 1982, married Ms Cao, who is from China, in 2006. The trial continues on Tuesday.