The Graham Dwyer trial has heard he allegedly sent Elaine O'Hara text messages outlining ways he could kill her including taking her to the woods and stabbing her.
The architect of Kerrymount Close, Foxrock denies murdering the childcare worker at Killakee mountain in August 2012.
The prosecution alleges that Mr Dwyer was in a BDSM relationship with Ms O'Hara, and that he stabbed her to death at Killakee mountain for his own sexual gratification.
Yesterday and today the jury has heard hundreds of text messages sent in 2011 between the childcare worker's iPhone and a prepaid mobile, allegedly used by the architect.
Ms O'Hara calls the man 'sir', he sometimes calls her slave and he asks her repeatedly to find a woman for him to stab - one time declaring that it is an order.
He claims 'it's yr fault i want to kill and you won't let me stab you'.
In one exchange from July 2011, he outlines four ways of killing Ms O'Hara who replies 'Sir I don't want to die'.
He texts back 'we all have to die sometime..there are ways of doing it without your consent'.
