The mother of Chu Sau-pan yesterday confessed to drowning the nine-year-old girl and putting her body in a fridge, police said. According to officers, Chung Choi-wan said from her hospital bed that she had put Sau-pan's head in a basin of water after giving her sleeping pills. Chung, 30, who has a history of mental illness, is recovering at Prince of Wales Hospital after taking an overdose during a trip to Shenzhen. Sau-pan's body was found in the fridge in a house near Fanling by her distraught father, Chu Wa-pui, and two Apple Daily reporters on Saturday afternoon. During a search of the house, the fridge door was opened by reporter Tsang Chau-man. The schoolgirl, believed to have been dead for two weeks, was wearing yellow shorts with a pink towel wrapped over her shoulders. The reporters called the police and tried to comfort the father who had reported Sau-pan missing. Senior Inspector Leung Kwok-kei of Tai Po district crime squad last night said Chung would be transferred to a custodial ward at Queen Elizabeth Hospital. Because of her condition, she is wearing hand and leg restraints. Chung suffered severe post-natal depression after giving birth to Sau-pan in 1987. The depression developed into mental illness and she was admitted to Castle Peak Hospital in 1992. She separated from her husband in April 1993 and later divorced. Mr Chu, 39, who works as a chef in Shamshuipo, was originally granted custody of Sau-pan, but because of his long hours, the child was given back to Chung. The mother and child lived in Wang Chau, near Yuen Long. Chung had rented other accommodation including the sparsely furnished house in Kan Tau Tsuen, where the body was found. Mr Chu, who had reported his daughter missing a fortnight ago, discovered last Tuesday that his wife was in a Shenzhen hospital after taking an overdose. He visited her, paid her hospital bill and brought her back to Hong Kong on Friday. He found a set of keys and some addresses on a note. Mr Chu visited one of the addresses in the Yuen Long area but found nothing. He also visited Kan Tau Tsuen but failed to locate the house. He returned on Saturday, accompanied by the reporters, and a villager took him to the address. He successfully opened the door using the keys he had found on Chung. A post-mortem examination is to be carried out on Sau-pan's body today. She was due to start Primary Two schooling at the beginning of this month. Police had issued a missing person's report on Friday.