In 1966, Romander was appointed Prosecutor-General of Sweden. He held that position until 1978 when he was appointed National Police Commissioner. During 1983-1984, Romander was personally involved in the investigation of Sweden's greatest blackmail cases, Operation Cobra. In February 1986, the Prime Minister Olof Palme was assassinated, Romander was about to retire, but was asked by the Swedish government to continue working and then came to be the highest police chief during the investigation's first two years. During a turbulent time, when the chief investigator Hans Holmér was fired, Romander was also commissioned by the government to take over the investigation together with the Prosecutor General. The government, through Minister for Justice Sten Wickbom, ordered Romander, despite the failure of the PKK lead, to continue the investigation against the Kurdish organization - with 300 police officers.