Steve Waight announced he will stand down as Sussex deputy police and crime commissioner, and Ms Bourne confirmed the decision.
“Steve has informed me that, due to personal reasons, he has decided not to continue in his role as deputy,” she said.
“This means he will leave the team early September, after working through his notice period.
“I am sorry to see Steve go and would like to thank him for the enormous contribution he has made during the early establishment of my office. I wish him every success for the future and look forward to continuing to work with him in his role as a West Sussex County Councillor.”
Mr Waight was appointed the £45,000 a year job in February despite the panel that scrutinises Ms Bourne’s work deciding not to recommend him for the post.