Graham Dwyer is to learn the result of his appeal against his conviction for the murder of Elaine O'Hara in 2012.
He was jailed for life in April 2015 after being found guilty of killing the childcare worker.
Her remains were discovered in Killakee Woods in the Dublin Mountains.
However the architect claims he was denied a fair trial.
On Monday, it will be 8 years since his conviction.
The reason it took so long is because his lawyers decided to first challenge the law that allowed for the retention of his mobile phone metadata and the subsequent accessing of it by gardai investigating Elaine O’Hara’s murder.
He won that challenge and unsurprisingly, the admissibility of the evidence at trial featured heavily in his appeal.
He also claimed prejudice was allowed to creep in to the trial and accused the judge of making a mistake by not taking the case out of the jury’s hands due to what they claimed was a lack of evidence.
Additional reporting by Today FM Courts Correspondent, Frank Greaney.