The jury in the trial of a woman accused of murdering her husband by stabbing him over 60 times has retired to consider its verdict.
Mr Justice Garrett Sheehan told the jury that they should find Tanya Doyle not guilty of murder, but guilty of manslaughter by diminished responsibility, if they believed she was suffering from a mental disorder at the time of the killing.
Mr Justice Sheehan said they must consider diminished responsibility even if Ms Doyle's actions on that evening were pre-meditated.
The 40-year-old from Pairc Gleann Trasna, Aylesbury in Tallaght has pleaded not guilty to the murder of 48-year-old Paul Byrne on 4 September 2009.
Prosecuting counsel Bernard Condon told the jury in his closing speech that Ms Doyle was a devious, calculating, vicious and deeply unreliable person and they could not believe anything she said.
He said the jury members would have to make up their own minds after hearing conflicting evidence from two forensic psychiatrists.
Consultant psychiatrist Dr Paul O'Connell previously told the court that Ms Doyle had schizoaffective disorder that would diminish her responsibility for the killing.
However, Professor Harry Kennedy of the Central Mental Hospital said even if Ms Doyle had a mental disorder or not, he did not think it played a major part in the alleged offence.
Defence counsel Brendan Grehan told the jury at the start of the trial that Ms Doyle alone had killed Mr Byrne and the issue was her mental state at the time she stabbed him.
The jury will resume its deliberations in the morning.