One of retiring police chief Tsang Yam-pui's last duties yesterday was to express his condolences to the family of an officer who died during an annual fitness test. Constable Ng Chun-shan, 30, of Happy Valley police station, collapsed in a Wan Chai park at the junction of Bowen Road and Stubbs Road about 10 minutes after he finished a 4.8km walk about 11am. Training instructors tried in vain to resuscitate him at the scene. Mr Tsang yesterday sent condolences to Ng's family. A police spokesman said an investigation would be carried out, and a report would be submitted to the Coroner's Court. It is understood Ng was among 30 to 40 officers from Happy Valley and Wan Chai police stations who attended the annual fitness test yesterday. Each officer was given a set time to complete a test. They could choose 20km of rowing, a 4.8km walk or a 2.4km run. 'The officer [Ng] opted for the 4.8km walk and he finished within 30 minutes. Under his age group, between 30 and 34, participants are required to complete the walk within 36 minutes and 45 seconds,' a police spokesman said. The spokesman refused to comment on whether the officer pushed himself too hard in the test. Participants had been checked to see whether they were fit for the test and Ng did not claim to be feeling unwell before the incident. Ng, who was married, joined the force in 1992 and transferred to Happy Valley police station in 2001. The 4.8km walk was introduced this year in order to give officers more options in the annual fitness test, according to the spokesman. They are required to take the test but can ask for an exemption if they feel unwell. Those who fail are allowed to resit the test two or three months later. In 1998, Superintendent Wong Wing-kei, 39, who had gained fame after arresting Tuen Mun rapist Lam Kwok-wai in 1994, died of a heart attack during a Police Tactical Unit training session in Fanling.