ELAINE O'Hara's computer contained downloaded images of mutilated bodies from a website as well as pornography and separate naked pictures of her, the Central Criminal Court heard.
Gardai also found two graphic stories in a private folder on Ms O'Hara's Apple laptop in which an unknown author describes being abducted by a man on the way to work, held in chains, whipped and knifed.
The trial of architect Graham Dwyer heard the photographs and documents were retrieved by gardai investigating the disappearance and death of Ms O'Hara.
Mr Dwyer (42), of Kerrymount Close, Foxrock, is pleading not guilty to the murder of Ms O'Hara (36), at Killakee, Rathfarnham, on August 22, 2012.
Ms O'Hara, a childcare assistant from Killiney, was last seen alive near Shanganagh Cemetery in Shankill that day.
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.
Det Gda Brid Wallace of the Computer Crime Unit said movie files were recovered from Ms O'Hara's computer and some were pornographic.
There were 16 image files with adult pornographic or BDSM content, she said.
Apart from that, there were personal videos that contained things like sporting events and family gatherings.
Mainstream movie or TV series included CSI (Crime Scene Investigation) and NCIS - a drama about a naval investigation team.
Still image files contained "a number of image files from a website of what were mutilated bodies", Sean Guerin SC, prosecuting said.
There were several images of Ms O'Hara herself, some self-taken and some taken by a different person. In some she was clothed and in others, partly-clothed or unclothed.
Det Sgt Wallace also recovered an image which was associated with Ms O'Hara's profile on the adult website Alt.com.
That image, and several others, were shown on monitors to the jury, Mr Justice Tony Hunt, Mr Dwyer and each legal team.
The main screens visible to the rest of the courtroom remained switched off.
Mr Guerin explained that other images appeared to show healed scars or marks around the mid-torso, one in which a mole or birth mark was visible on the right breast.
In a book file, Det Gda Wallace found the document "Serial Violence: Analysis of Modus Operandi and Signature Characteristics of Killers".
The book contained graphic images of mutilated bodies and crime scene photographs, the court heard.
Also retrieved were two Microsoft word documents called "Letter to Stuart" which were created on April 1, 2010 and June 25, 2012.
In the first, Ms O'Hara spoke of being angry, writing: "All my thoughts are negative. I just don't have the energy to do any-thing positive. When the anger goes down will make contact."
The second letter also expressed anger, stating: "When I get mad it makes me want to hide away and cut myself to release the anger."
Two other documents discovered in 'private' folders were read to the court by Mr Guerin.
The first, created on April 15, 2009, gave a detailed first-person account of being abducted by a man on the way to work, locked in the boot of a car before being held at a location where the person writing the piece was held in chains, whipped and knifed.
In it, the writer graphically described how the pain "sent shivers down my spine" and they can "hear the blood dripping".
Another document in a private sub folder called "mystory.doc", from November 5, 2011, told of a person being thrown in a cellar and whipped.
Earlier, Mr Dwyer's sister, Mandy Wroblewski, told the jury she knew nothing about an 083 mobile phone number that gardai questioned her about.
Asked about post that Mr Dwyer sent to her and her family at their home in Tipperary, Ms Wroblewski said sometimes the address would be misspelled.
The trial continues.