Justice Brewer described it as a "very sad case".
While Laybourn was yet to enter a plea, Justice Brewer entered a not guilty plea on his behalf so that the judicial process could continue.
The judge said with him entering the plea any impact of a change in plea wouldn't impact the accused and any discounts he would be entitled to.
Justice Brewer also set a trial date for one week from August 2 next year.
He also ordered a report to be completed for the accused's mental capacity to stand trial.
The accused, who was charged the day the country's euthanasia referendum results were announced, was granted further bail to reappear in January.
The Herald understands the wife was unharmed after the incident and that they had been together for more than 50 years.