Simon Byrne has stepped down as chief constable of the Police Service of Northern Ireland (PSNI) with immediate effect.
It comes after a month of controversies for the force, and an emergency meeting of the Policing Board last week.
Mr Byrne has been under pressure following a major data breach from the PSNI in early August.
Last week, a high court judge ruled two junior officers were unlawfully disciplined for an arrest made at a Troubles commemoration in 2021.
Report by Jonesia.
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