Before his death Detective Sergeant Whittaker and other Police had been involved in a major drug investigation which had resulted in the arrest of eighteen offenders. Corruption allegations were made by a number of the offenders resulting in a Police Internal Security Unit investigation. During the protracted internal investigation the Sergeant was under enormous pressure and as a result suffered a cerebral haemorrhage. He passed away at the Royal North Shore Hospital on 28 September 1991. He was posthumously cleared of all allegations by Judge Allen at the Sydney District Court on 30 September 1991. The Sergeant was born in 1960 and joined the New South Wales Police Service on 17 April 1979. At the time of his death he was attached to the Gosford Drug Unit.