"When I had an affair I went and confessed," said a husband so deluded his wife was cheating on him he stabbed her to death, a Sydney court has heard.
"All I want is for her to confess."
Mourad Kerollos was so obsessed with the idea his wife was a prostitute making adult films for money he regularly checked her mobile phone, installed a GPS tracker on her car and began secretly recording her conversations.
He then followed her out of her last shift at Prince of Wales Hospital in Randwick and stabbed her multiple times in the neck before dialling triple zero.
"I kill my wife," he told the operator.
Crown prosecutor Pat Barrett read out the evidence summary on Wednesday in the NSW Supreme Court trial of the 62-year-old who has pleaded not guilty to murdering Gihan Kerollos on the grounds of mental illness.
There is no dispute he did intend to kill or seriously injure her on May 18, 2019.
The issue for Acting Justice Peter Hidden is whether he was mentally ill at the time or if the charge should be reduced to manslaughter.
Ms Kerollos, fondly known as Gigi, told a colleague and close friend of 13 years that she had split with her husband but they remained living together for financial reasons.
Jacqueline Crombie witnessed Kerollos randomly showing up at their work, fighting with her in Arabic about her "cheating" and heard a telephone argument where he was angry the pair were going out.
At the beginning of 2019 Ms Kerollos told Ms Crombie: "I don't know if he is insane or just evil."
About two weeks later Ms Crombie asked how he could possibly believe she was having an affair as she spent all her time at work or at home.
"He's got two personalities," she responded.
She told Ms Crombie he was stalking her when he showed up at a legal appointment she had told nobody about, demanding to know what she was doing.
About a month before she died Gihan sat down for breakfast with other friends and was called more than 10 times by Kerollos who forced her to turn on her Facetime video.
She asked about domestic violence leave and said she feared he was planning "a kameen," meaning ambush in Arabic.
About a week later she told these friends she could no longer see them as she was worried for their safety too.
"If he comes to talk to your husbands or you at any time call the police. I think he's planning something very bad."
A trusted bishop with her Coptic Orthodox Church said he could grant her a divorce on the grounds he had been unfaithful.
She told another member of her church that money she invested in their mortgage had been withdrawn by Kerollos to gamble overseas.
As his mental health seemingly deteriorated Kerollos had on a number of occasions promised to see a psychologist and was diagnosed with either bipolar or depression by his doctor.
His sons confirmed to police after the stabbing that lately he was drinking heavily and smoking cannabis.
Following his arrest in hospital Kerollos asked Detective Senior Constable Kelly Gatt: "How is she?"
To which she replied: "How is she? She is dead."
"Dead," he responded and began to cry and shake his head.
Forensic psychiatrist Kerri Eagle examined Kerollos after the killing and is due to tell the trial that he was suffering from a psychotic disorder featuring the "Othello syndrome".
The delusion of infidelity began about two or three years before the killing as their marriage began to break down, and around the same time as he himself had an affair, Dr Eagle is expected to say.
Her medical opinion determined his psychotic illness resulted in impaired judgment, reason, and the inability to know whether his actions were right or wrong.
The trial continues.