The court heard that three days before she died, Ms McNally had exchanged 33 WhatsApp messages with an ex-boyfriend.
Those messages were part of the suspected “catalyst” for her killing, it was contended.
Ms Pinkerton highlighted a “side mission” within the violent Grand Theft Auto game involved the player murdering a woman by hitting her with a car and making it look like an accident.
It was claimed that McCullagh needlessly chose to play the side mission at that specific time.
It was revealed in court that McCullagh requested and was permitted to spend time alone with Ms McNally’s body, prior to her funeral, on Christmas night.
“He spent roughly 20 minutes with her undisturbed. What he was doing is unknown,” Ms Pinkerton added.
A man has pleaded not guilty to murdering Lurgan woman Natalie McNally.
www.belfasttelegraph.co.uk
Mr Justice O'Hara then enquired about a trial and was told by defence barrister John Kearney KC that the hearing is expected to last three to four weeks.
The defence barrister raised the issue about a venue for trial.
Revealing there will be a "considerable" amount of CCTV presented to the jury, Mr Keaney asked that the trial be held in Belfast.
This, he said, was due to technical reasons as he said Belfast would be better equipped to deal with the IT requirements needed and would be the "preferred option."
Mr Justice O'Hara set a trial date for Monday, September 9.
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