Mr Byrne had been under pressure after a data breach last month where information on about 10,000 officers and staff was accidentally disclosed online.
The chief constable of the Police Service of Northern Ireland has resigned following a series of controversies, including a major data breach and the unlawful disciplining of two junior officers.
Simon Byrne had faced a motion of no-confidence in his leadership from the Democratic Unionist Party . Its leader Sir Jeffrey Donaldson had said:"Confidence in the chief constable has been eroded, both amongst the wider public but, significantly, also amongst serving PSNI officers and staff.
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