Graham Dwyer's hoping for a significant boost from a European Court of Justice decision on the retention of mobile phone data today.
It could greatly help his appeal against his conviction for the murder of vulnerable childcare worker Elaine O'Hara.
Last November an advisor to the ECJ said retention of phone data isn't justified in prosecutions.
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A final judgment is due today - and barrister Ronan Lupton expects a boost for Dwyer.
"There is a strong chance that the advocate general's opinion handed down last November will in fact be followed by the ECJ in its ruling today," he added.
