The son of a 74-year-old woman who died in Princess Margaret Hospital a day after a bone operation has claimed that the investigation panel on the case was not independent and might not be fair enough. With the help of the Democratic Party, Chan Kwok-man sent a letter to Hospital Authority chairman Anthony Wu Ting-yuk to ask that all three panel members be replaced. But the hospital said it had no intention of reshuffling the panel and, if the family had any opinion on its report, it could file a complaint with the Hospital Authority's public complaints committee. The panel set up on Sunday includes Kwai Tsing District Council chairman Chow Yick-hay, Kowloon Hospital chief executive Derrick Au Kit-sing and the Kowloon West Cluster's nursing manager, Slyvia Fung Yuk-kuen. 'Au and Fung are Hospital Authority staff while Chow is a member of the hospital's governing committee,' Mr Chan said. 'They are very close to the hospital. This composition of the panel is unfair to me and my mother. The hospital should appoint other people who are completely independent.' The panel invited him to the first meeting today, but Mr Chan said he would not attend if the members were not changed. Democratic Party lawmaker Lee Wing-tat suggested that the hospital should appoint independent people, such as private doctors and other public figures. Mr Lee said he had called Mr Chow, who was also a party member, and gave him a 'friendly reminder' that he might not be an ideal candidate to conduct the investigation because of his close relationship with the hospital. However, Mr Chow insisted he would not resign from the panel. 'It is a hospital-level investigation into the nursing procedures conducted on the patient to see if there can be any improvement,' Mr Chow said. 'All three of us are not Princess Margaret Hospital staff. The panel can be fair.' The patient, Chan Woon-sik, fell from a hospital bed and underwent an operation to fix her broken leg on Friday, but died the next day.