Police yesterday named a 14-year-old girl struck and killed at home with a dumbbell as Ching Kin-ming, while officers continued intensive door-to-door questioning. Kin-ming's father promised yesterday to donate his daughter's organs, saying he hoped they would help those in need of transplants. The teenager died on Sunday night, 16 hours after surgeons at the Prince of Wales Hospital performed an operation on her fractured skull. As detectives carried out further door-to-door inquiries around her flat in Tsui Wo House on Tai Wo Estate, Tai Po, yesterday, police revealed her school bag and mobile phone were missing. Officers also confirmed that she had been hit with the dumbbell several times. Detectives found the weapon on the girl's bed along with a bloody palm mark on the wall and a condom wrapper in the doorway of the flat. The girl was naked from the the waist down, but police have not revealed whether she was sexually assaulted. Kin-ming was attacked on Friday while alone in the flat. Her mother came home from work at about 6pm to find her daughter unconscious on the lounge floor. She suffered multiple fractures to her skull and her right thumb was broken. There was no sign of a break-in, leading police to believe the girl may have known her attacker. A postmortem examination will be carried out today. Detectives have questioned Kin-ming's male classmates and several friends of her brother.