A court has heard Graham Dwyer told gardaí he did not murder Elaine O'Hara and that they should interview other men who were involved with the childcare worker.
The prosecution is drawing to a close in the trial of the architect from Kerrymount Close in Foxrock who denies killing 36-year-old Elaine O'Hara at Killakee mountain.
Her skeletal remains were found in September 2013, nearly 13 months after she went missing.
Det Sgt John Colgan has been giving evidence of Graham Dwyer's fifth and final garda interview in the early hours of October 18, 2013.
The architect had been arrested at his home in Foxrock the previous morning.
In this last interview gardaí presented him with downloads they had found on his HTC work phone.
Many of them appeared to be images of women being stabbed and strangled, and Graham Dwyer was asked if he had accessed the images. He replied: "If the machine says it, I agree".
He said they were extracts from horror movies.
One was called "woman stabbed live leak". Graham Dwyer said that sounded like a real killing in Russia and said again that would relate to his interest in movies.
A third document was put to him titled "Lovely disgrace.com 17 yr old girl immobillised gagged and killed on her bed with more than 80 stab wounds all over her body".
He said he would have looked at gore websites on his laptop - "I can't explain it," he said. "I know it's sick".
As the interview drew to a close Graham Dwyer was asked if he wanted to make any comment.
He replied firstly that he was not guilty of this offence and secondly, from what he had learned there, were lots of men Elaine O'Hara had contact with that gardaí should talk to.
He said that had not been done.
In earlier interviews he admitted he had had BDSM relations with Elaine O'Hara but denied that he had stabbed her or used secret phones to make contact with her.
Earlier the defence cross examined a leading detective in the case about gardai leaking information to the media following Graham Dwyer's arrest.
Det Sgt Peter Woods agreed there had been leaks and that he had been fuming about it.
He said: "It's the most unusual case, I've never come across a case like it."
The prosecution has now finished presenting its case and the trial will resume next Wednesday.