The jury in the trial of a 49-year-old Dublin man accused of murdering his wife has been sent home for the weekend.
The jury will resume considering its verdict on Monday morning.
David Bourke of Laverna Dale, Castleknock denies stabbing to death Jean Gilbert on the 28th of August, 2007.
Prosecuting counsel Isobel Kennedy told the jury that the defence of provocation could not stand because the evidence showed a careful and calculated thought process in the run-up to his wife's death.
She said stabbing his wife four times and his reasons given to gardaí immediately afterwards showed he was an angry and jealous man who did not want his wife to leave him.
She said he decided to get the knife several hours before the killing.
That was not the action of a man who had a total and sudden loss of self-control as the defence of provocation requires, the court was told.
His actions were that of a man in control who in a clear-headed way thought about what he was going to do, Ms Kennedy added.
Counsel for the defence Colm Smith told the jury that this had been a sad and tragic tale from beginning to end.
He said even the most cynical would have been touched by the tragedy that befell the family. He said the family was an ordinary one until Robert Campion re-entered the life of Jean Gilbert.
The letters from Mr Campion showed the measure of the man who was coming to destroy Mr Bourke's family, the court was told.
Mr Smith said Mr Campion had preyed on Ms Gilbert who had paid for his hotel, car and storage for his belongings, and was planning to sell her rings to fund a trip to Japan.
He described Mr Campion as 'a classless, ageing, half Italian gigolo' who was ruthless and heartless and only wanted to gain financially from Mr Gilbert.
He had wrecked the marriage and seduced Jean Gilbert, causing her to be infatuated and taking her from her life, the court heard.
Mr Bourke killed his wife, but the only question was whether he was guilty of murder or manslaughter, Mr Smith added.
He said Mr Bourke would be relying on the defence of provocation and would illustrate that his state of mind left him unable to prevent himself from killing his wife.