Techniques on how to pick and kill a target among files on laptop
Books on different ways of killing people were discovered in files saved on Elaine O'Hara's computer, the Central Criminal Court has heard.
The documents retrieved from the hard drive of the Apple Mac included "picking a target" and different weapons and methods, an expert from the Garda computer crime unit said.
Detective Garda Brid Wallace said she also discovered Google Maps images of Killakee woods in the Dublin mountains and reservoirs near Roundwood, Co Wicklow, in a second device owned by Ms O'Hara.
Elsewhere, an old Dell laptop, which Ms O'Hara had previously owned, showed contact between her and the profiles architect77 and architect72 on the adult alternative sex website Alt.com as far back as 2007.
Det Gda Wallace was giving evidence on day 22 of the trial of Graham Dwyer of Kerrymount Close, Foxrock, Dublin, who denies murdering Elaine O'Hara in Killakee, Rathfarnham, on August 22, 2012.
She told Sean Guerin SC, prosecuting, that three PDF type documents were found in a Downloads folder entitled 'ReadThis' in the Apple Mac in September 2013 - shortly after Ms O'Hara's skeletal remains were recovered.
The first, a publication called '21 Techniques For Silent Killing', featured chapters titled 'Manual Weapons', 'Spike', 'Knife' and 'Nunchaku'.
The second, a 35-page booklet called 'Hidden Weapons.pdf' had accounts of various weapons listed in the contents.
Another document, 'Murder Inc', was a 62-page book by "Jack the Rippa" and the table of contents included 'Chapter 1: The Mark, Chapter 2: Unarmed kills, Chapter 3: Edged and piercing kills', and another chapter entitled 'Gun Kills'.
Mr Guerin said this went on to identify "a number of different ways of killing people and identifies methods for picking a target and various ways to kill people."
The last access to this document was August 18, 2012.
Det Gda Wallace gave detailed technical evidence for most of the day, breaking only for Mr Dwyer's former partner Emer McShea and their adult son Sennan to take the stand.
A file she retrieved - dyslexiaandreading.doc - was an assignment on reading and dyslexia with children and the author in the last modified record was "adwejchert".
An identical copy was found on one of My Dwyer's computers and could have been emailed to Ms O'Hara or transferred by USB, Det Wallace said.
On a HP notebook, images were discovered from Google Maps of Cruagh and Killakee in the Dublin Mountains, said Mr Guerin, adding: "It also included reservoirs near Roundwood where some of the items of interest in the investigated were found."
"Correct," the detective replied, adding no date or time slots could be found on them.
A search of the internet history confirmed Ms O'Hara had visited Alt.com, where the profile was listed as a "silver member".
An old Dell was also handed in to gardaí by the woman after Ms O'Hara's remains were recovered, the court heard.
Under Ms O'Hara's profile, Det Gda Wallace again discovered images of DublinMaster or MasterWilliam from Alt.com.
She also traced two profiles "suborslaveforyou" and "submissive391", which had viewed a profile name Architect77 five times in 2011 on Alt.com.
She had also been in communication with the profile architect72, which Mr Guerin said had the email address firstname.lastname@example.org and had emailed email@example.com. "I've assumed you are trying to get better and trying to stay away from what we do together. I completely understand," he wrote in one September 19, 2008.
"Anytime you want, I will gladly carry out what I promised I would do, regardless of the consequences.
"All you have to do is ring me from a call box and say where and when, even if it's months or years away. I'm always waiting," it added, signing off "x Sir".
The trial continues.