Shahab Ahmed fatally stabbed his wife 14 times then smoked several cigarettes and went on Facebook before calling triple zero but "he's not a violent man", his barrister has told a Sydney judge.
Ahmed has pleaded not guilty in the NSW Supreme Court to murdering his wife, Khondkar Fariha Elahi, 29, in their Parramatta unit in February 2017, claiming the partial defence of substantial impairment by abnormality of mind.
In his final submissions at the judge-alone trial on Wednesday his barrister Avni Djemal said a lack of violence had been a trait of Ahmed while his marriage broke down.
"Through a two-year breakdown with serious evidence of infidelity ... other than the punching of a gib rock wall, there's no violence," he said.
"This man has no criminal convictions."
According to the agreed facts, Ahmed stabbed his wife after dragging her to their bedroom and demanding she unlock her phone, where he found sexual messages from his former friend Omar Khan.
Mr Khan previously told the court he and Ms Elahi had been having an affair since July 2015 involving passionate kissing and hand-holding but no sex.
The pair had exchanged highly sexual messages, gifts on birthdays and Valentine's Day and had referred to each other as "hubby" and "wifey".
The defence argued that at the time of the stabbing Ahmed was substantially impaired by depressive illness, and that seeing the messages, combined with the knowledge his wife wanted a divorce, had acted as a "trigger" for him to lose control.
"He must have been so impaired at the time that that can be the only real explanation ... for what he did on that day," Mr Djemal said.
Psychiatrists for both the Crown and the defence agreed Ahmed was suffering from a mental condition at the time. The issue was whether that condition was so substantial it meant he couldn't control himself.
Justice Monika Schmidt referred to Ahmed's actions after his "murderous rage" had subsided.
"What he then said (to police) was very chilling because it suggests that there was an opportunity once he'd stopped stabbing his wife for him to call aid, but he didn't," she said.
"He waited for her to stop breathing."
Justice Schmidt will hand down her verdict on a later date.
Australian Associated Press