Graham Dwyer has won his legal action against the State and the Garda Commissioner over the use of mobile phone data during his trial.

The former architect was convicted by a jury three years ago of the 2012 murder of childcare worker Elaine O’Hara.

Mobile phone data formed a huge part of the trial but Dwyer argued it shouldn’t have been used as it breached his rights.

The High Court has ruled that Irish laws – which allow for mobile phone data to be retained and accessed – breaches EU law.

He has already stated his intention to go to the Court of Appeal to challenge his murder conviction.