Graham Dwyer has lost his appeal against his conviction for the murder of Elaine O'Hara.
The Court of Appeal found that the limited admission of call data could not give rise to a miscarriage of justice.
It means the 51-year-old architect. who was found by a jury to have stabbed the 36-year-old woman to death on 22 August 2012 will remain in prison to continue serving his life sentence that was handed down to him.
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Graham Dwyer was convicted in March 2015 but has been in custody since his arrest on 17 October 2013.
