The judge is giving his final directions to the jury in the Graham Dwyer murder trial.
Mr Justice Tony Hunt has instructed the seven men and five women to set aside their feelings and reach a verdict on the evidence alone.
Mr Dwyer, an architect from Kerrymount Close, Foxrock denies killing childcare worker Elaine O'Hara at Killakee in Dublin in August 2012.
Her remains were found in September 2013 and no cause of death was established.
The judge has told the jury they must be "conscientious and analytical" in their approach and avoid speculation.
The onus is on the prosecution to prove its case beyond reasonable doubt.
Because of the unpalatable features in the case, Mr Justice Hunt has urged them to be especially vigilant and ignore any feelings they may have towards the accused who enjoys the presumption of innocence unless they alone find otherwise.
He said it is "difficult to be fair to someone who is not likeable".
In this regard, he made particular reference to the video evidence of the architect stabbing women during sex.
He told them that this was not shown in order to shock them nor to make Mr Dwyer look foolish, but for them to assess potentially relevant motivations.
The jury has been told to look objectively at what may have happened on the evening of August 22nd 2012 when Elaine O'Hara went missing.
He said the prosecution has to keep Graham Dwyer in the picture all the way and that "proof of unusual thoughts or fantasies do not constitute a crime" unless the ingredients of murder have been established.