A 31-year-old woman, apparently distraught over her husband's extra-marital affair, plunged to her death from the 37th floor of her Sheung Shui home with her 14-month-old daughter yesterday. Police said the woman's father reported at 5.18pm that his daughter was going to commit suicide from the flat in Royal Green in Ching Hui Road. 'The father told us that the daughter said she had killed the baby and was about to kill herself,' Jackey Cheung Koon-Wah, assistant district commander of Tai Po (crime) said. Police and the father rushed to the scene but found the bodies of the woman and the baby on the building's podium. Ambulancemen declared them dead at the scene. The woman had knife wounds to her wrist. 'We found six suicide notes. They were written to her relatives and husband,' Mr Cheung said. The notes led police to believe the husband's extra-marital affair was the cause. 'The couple had a very poor relationship before what happened. The deceased woman had already moved out of their home with her belongings and had been living with her father before the tragedy,' Mr Cheung said. The woman jumped from the flat where she had lived with her husband. The husband, an estate agent, rushed home after learning of the deaths. Inside the flat, officers found a blood-stained knife and sleeping pills on the floor. Detectives from Tai Po district crime squad are investigating the case, classified as murder-suicide. Against Child Abuse director Priscilla Lui Tsang Sun-kai said she was saddened by the tragedy. 'Children in Hong Kong are not that safe now. We should deploy more resources to help children as well as families,' she said. 'For example, we could have volunteers who are good parents paying home visits to other families. This could help to identify families in crisis, helping them before the occurrence of any tragedy, and offer more useful information to these families.'