Graham Dwyer is due to appeal his murder conviction today.
In 2015, Dwyer was found guilty of murdering childcare worker, Elaine O’Hara, in a trial where phone data was a crucial plank in the case presented to the jury.
Logs of call records and location data in relation to a number of mobile phones were used to link him to what happened to Ms O’Hara.
The prosecution believed he killed her to realise his own sexual fantasies.
Now 49-years-old, Dwyer has not strayed far from the headlines since his conviction; his legal challenge against the law that allowed for the indiscriminate retention of mobile phone metadata was successful.
That paved the way for him to bring an appeal against the murder conviction itself.
The hearing is expected to last two days.
Main image: Graham Dwyer. Picture by: Alamy.com