A 'neurotic' husband bludgeoned his wife to death because he believed she was planning to run off with a Taoist priest who offered to heal their autistic daughter, a court heard. Tsang Ying-sang, 52, stopped taking his psychiatric medicine at least two weeks before he fractured his wife's skull with a 37 cm screw, psychiatrist Dr Henry Yuen Cheung-hang told the Court of First Instance yesterday. He said that unemployed Tsang had repeatedly refused to be admitted to hospital for psychiatric treatment. Tsang was said to be suffering from dysthymic disorder, characterised by neurosis or depression. He was supposed to be taking medication, but no trace of it was found in a blood sample taken just after the killing. Dr Yuen said it would have taken at least two weeks for the drug to leave his system. Tsang, 52, pleaded not guilty to murder. In the early hours of June 23 last year, he called police and told them he had killed his 47-year-old wife, prosecutor Peter Chapman said. Police and ambulance officers found Yip Choi-kiu's body lying in a pool of blood at the couple's Tai Po flat. Principal ambulance officer Tam Wan-kit said it appeared Yip had been dead for several hours and that she had been struck several times over the head. The large metal screw was beside her, the court heard. Tsang told police he killed her because she wanted to leave him for someone else, the jury was told. Tsang told psychiatrists the other man was a priest surnamed Ng who was trying to heal their autistic four-year-old daughter. The little girl was discovered in the flat and taken to hospital running a fever. One of the couple's neighbours said that some time after 1 am she had heard noises, followed by the sound of a woman shouting for help. Believing it to be a simple domestic dispute, she took no action, the court was told. The trial continues before Mr Justice Mohammed Saied.