Murder accused Graham Dwyer told gardai he knew it was "sick" that he visited "gore" websites.
Mr Dwyer made his comments to gardai in the fifth and final interview after he was arrested on suspicion of murdering Elaine O'Hara.
He was being questioned by a detective investigating Ms O'Hara's death when he was asked about a series of images found on his mobile phone that had been seized by officers on the morning of his arrest on October 17, 2013.
Mr Dwyer explained that these images came from different websites.
When asked why he visited such websites, Mr Dwyer replied: "I can't explain. I know it's sick."
Mr Dwyer (42), an architect from Kerrymount Close in Foxrock, denies murdering Elaine O’Hara (36) on August 22, 2012, in Killakee Woods in the Dublin mountains.
Her remains were found by a dog walker in undergrowth in the Dublin mountains on September 13, 2013.
The prosecution maintains Mr Dwyer killed her for his own sexual gratification.
Today, Detective Sergeant John Colgan of the National Bureau of Criminal Investigation gave evidence of the accused's fifth and last garda interview. He told Mr Guerin it began at 5.47am on October 18, 2013.
Most of the interview was taken up with Det Sgt Colgan putting to Mr Dwyer items that were retrieved from his phone, which had been seized on his arrest the previous day. He was asked on each occasion if he had accessed the files in question.
The first items were from a Youtube application - the first was “Close up stabbing” and the time stamp was May 26, 2013.
“Whatever it says, I go along with that, I don’t recall what it is,” Mr Dwyer said.
To “Woman stabbed prison guard,” dated on April 23, 2013, he stated: “If the machine says that, I would agree with that. It would be related to horror.”
Two more files were titled “Stabbing” and “Stabbing 3” and he said: “If the machines say so, you would find that they are extracts from horror movies.”
Two others were titled “woman strangled” and “woman strangled yoga,” dated May 30, 2013.
Again he was asked if he accessed these files.
“I wouldn’t dispute it but I have to say I never strangled anybody,” Mr Dwyer replied.
Asked about “Woman stab Live Leak,” he said: “That sounds like a real murder, I think it was a real murder in Russia.”
Of the file title “Woman strangled by friend” dated June 10, 2013, he said: “Again, that would be my movie interest, that would be a specific clip, I think it’s all drama except the Live Leak stuff.”
Shown a file called “woman stabbed” from June 22, 2013, he said: “The same sort of thing, I would say.”
A second document contained an item entitled “submissive”, with contact values “submissive hyperlink mail to 391@Gmail.com”.
“Can you explain who that is?” he was asked.
“Is it Elaine O’Hara?” Mr Dwyer replied.
“I believe it is,” Det Sgt Colgan said.
“I was asked for that earlier and I couldn’t recall but it was Elaine’s,” Mr Dwyer said.
A third document put to him in the interview had two images of what appeared to be the same female from Lovelydisgrace.com.
One was entitled “17 year old girl immobilised, gagged and then killed on her bed with more than 80 stab wounds all over her body.”
“I would have looked at these websites on my laptop, they are gore websites, again concerned with horror.”
He was asked why he needed to go on the sites.
“I can’t explain, I know it’s sick,” he said.
He was asked if the Gore sites were related to the “Gorean Lifestyle.”
“I don’t think so,” he said.
He was also asked about four small snapshots that were downloaded from his phone. One was of a female breast with a screwdriver inserted into it with wounds.
Mr Dwyer said it was a “horror picture”, probably from the same source as the others and he did not take them.
One picture was of a young girl and another was a “semi-naked female covered in blood with somebody standing over her.”
“That would be a similar thing,” the accused had said.
There was also a picture of a cut finger, which Mr Dwyer said was his hand, after an accident with a model plane.
He was then asked if he had anything else to add.
“I have two comments to make, first, I am not guilty of the offence I am being presented with, and second, from what I have heard today and from what I knew before today, there are other people you should talk to as well as me and that is not being done in my opinion,” he said.
He was asked what people.
“Anybody else like me who has been in contact with Elaine O’Hara,” he said.
He was asked if he knew the details of any other person .
“I don’t know the identities of the men, that is all I have to say,” he said.
The interview finished at 6.50am and the notes were read over to him.
“I want to record what I said earlier, that it paints a picture of what I look at as a proportion of what I also look at. Please don’t present to people that that is all I look at.”
Cross-examined by Mr Farrell, Det Sgt Colgan said he could not tell if the items had been looked at on a laptop or if the Youtube application on the phone had been syncing with the accused’s account.
He was also not able to answer questions about the time stamps.
Later, the jury of seven men and five women were told that the prosecution's case was finished.
Mr Justice Tony Hunt advised them to take a break over the weekend and put the case to one side.
The trial is expected to resume on Wednesday.
On October 17, 2013, two men met for the first time. That was when Detective Sergeant Peter Woods, who led the investigation into the death of Elaine O'Hara, called to the door of architect Graham Dwyer's home in Kerrymount Close, Foxrock at 7.08am to arrest him on suspicion of murder.
MURDER accused Graham Dwyer told gardai: “I don’t know what you are talking about” when he was arrested on suspicion of the murder of Elaine O’Hara, the Central Criminal Court has heard.