The jury in the Graham Dwyer trial has been shown video clips of a man alleged to be Mr Dwyer appearing to stab women during sex.
The 42-year-old Cork native with an address at Kerrymount Close, Foxrock, Dublin denies murdering childcare worker Elaine O'Hara at Killakee Mountain in Dublin in August 2012.
For the third time in this trial Mr Justice Tony Hunt warned the jury that upcoming evidence, this time video clips, would not be easy.
Eleven short videos found on a hard drive at the architect's house were played.
They had names like bloodletting, first stabbing, after third stabbing and most appear to show Graham Dwyer cutting and stabbing tied up women in the stomach and chest during sex.
Sean Guerin prosecuting explained that in some of the videos the women's faces have been pixilated.
The second video shows the architect talking to the camera about having just knocked himself out with chloroform. He says to camera: "I'm very disorientated. I'm dizzy and have very little recollection of what happened."
The jury also heard from Detective Garda Brid Wallace of the contents of a hard drive of a desktop seized by gardaí from Graham Dwyer's office A&D Wejchert including a written account of a woman being raped in a cave.
The architect is alleged to have been in a BDSM relationship with Elaine O'Hara and to have stabbed her to death for his own sexual gratification.