Trial told O'Hara's laptop contained documents on murder and silent killing

Graham Dwyer's trial has heard documents called "Murder Inc" and "21 Techniques of Silent Killing" were found on his alleged victim's Macbook computer.

The Cork born architect with an address at Kerrymount Close, Foxrock, Dublin denies murdering childcare worker Elaine O'Hara at Killakee mountain in Dublin in August 2012.

Her remains were found in September 2013.

The court heard Detective Garda Brid Wallace analysed an image of the hard drive on Elaine O'Hara's Macbook as part of the investigation into the 36-year-old's death.

Yesterday she told the jury she found photos of mutilated bodies from the web on the childcare worker's laptop along with documents about torture and slavery.

Today she resumed her evidence for the prosecution. She described three PDF files in the downloads folder.

One called 21 techniques of silent killing had chapters about weapons, the knife, the spike, the nunchuk.

A second was about weapons and the third was called "murder inc" by "jack the rippa" and identifies a number of different ways of killing people.

The jury also heard that gardaí found instant messages sent between Elaine O'Hara and various people, presumably men, in late 2010.

She used the profile name bound with the associated email address boundforyou.slave7 and discusses BDSM sexual activities, how she's looking for a master and the website alt.com –

It is the prosecution's case that Elaine O'Hara was involved in a BDSM relationship with Graham Dwyer and that he stabbed her for his own sexual gratification.