Victoria Police Chief Commissioner Christine Nixon has announced she is resigning from the top job.
She told reporters in Melbourne she would not renew her contract when it expires in April.
Ms Nixon was sworn in as chief commissioner April 2001 and was the first woman to be in charge of an Australian police force.
She will remain in the position until the end of March.
Ms Nixon said she told the Victorian government on Friday of her decision.
"Despite the offers from the government to continue, I believe it's time now that I hand over after nearly eight years as chief commissioner of Victoria and 36 years as a police officer," she told the media conference.
"I thank the premier (John Brumby) and the (Police) Minister (Bob Cameron) for their offer and their support and I believe that I'm leaving Victoria Police in good order."
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