Martin Richards has stated his intention to retire as Sussex Chief Constable as of next year.
CC Richards - who prior to joining Sussex six years ago served as chief constable in Wiltshire - is to step down in March following a policing career of 32 years.
Speaking of the decision, he said: "My career as a police officer has been a rewarding one and it has been a particular privilege to serve as Chief Constable of Sussex.
"It had always been my intention to retire as is usual after 30 years service, but I felt it right to support first the Police Authority in their final months and then the newly-elected Police and Crime Commissioner through into her second year in office.
"I shall remember with affection and admiration a workforce that consistently demonstrates the highest qualities of compassion, courage, a sense of justice and above all an overwhelming desire to serve."
Sussex PCC Katy Bourne, said: "I would like to recognise Martin's tremendous contribution to Sussex Police during his six years as Chief Constable.
"During his service as Chief Constable he has steered the force through difficult times and met some significant financial challenges. It has been a pleasure working with him during my first year in office and he has been a great support to me."