Pat Hickey has resigned from the executive board of the International Olympic Committee.
It's the controversy surrounding ticket-selling at last year's Games in Rio.
The former head of the OCI faces trial in Brazil in November, over an alleged scheme to sell tickets illegally.
In a statement on its Twitter page overnight, the International Olympic Committee said Pat Hickey has resigned "with immediate effect" from its executive board.
In his resignation letter, the 72-year-old said he wanted to "ensure that the interest of the National Olympic Committees are represented on the executive board."
He also reiterated his innocence of all charges, and said he hoped to exercise his functions as an IOC member in the future. His vacant post will be filled by election in Lima this week.
Pat Hickey was arrested by Brazilian police during the Olympic Games and held in jail for almost two weeks before being released on health grounds.