Sin Kam-wah joined the force as an inspector in 1977 and rose through the ranks to become a senior superintendent in April 1998.
He was arrested in May last year by the Independent Commission Against Corruption when he was deputy head of the Narcotics Bureau.
The high-profile arrest outside the Harbour Plaza Hotel in Hunghom sparked an unprecedented public row between the anti-graft body and the police.
Sin's name was released to the public before he had been charged and police said the anti-graft body should be 'more circumspect' when handling such cases.
During his 26 years in the force, Sin had been posted in various divisions, such as the Police Tactical Unit, Police Public Relations, the Organised Crime and Triad Bureau (OCTB) and Narcotics Bureau.
While working with the OCTB, Sin was involved in three major anti-triad operations involving undercover agents.