33-year-old Sofia Sam and 35-year-old Arun Kamalasanan are on trial in Melbourne for murdering the woman's husband Sam Abraham at his home in Epping, Melbourne in October 2015.
On Tuesday, the Victorian Supreme Court heard a tape where Kamalasanan was secretly recorded by an undercover police officer.
Arun Kamalasanan was allegedly heard saying: “I took that guy off. I went there with the powder, sleeping pills ... and I gave it.”
Police allege Mr Kamalasanan was having an affair with the wife of the dead man, Sofia. The court earlier heard the duo professed their love for each other in a secret diary.
Prosecutors have said the duo plotted the crime together.
reports jurors on Tuesday heard a recording where Mr Kamalasanan says he planned the murder without Ms Sam’s knowledge. .
He reportedly said he hid in the house and drugged the whole family including their 6-year-old son.
He then says how he gave cyanide laced orange juice to Sam Abraham: “I gave the powder.”
Asked what the powder was, Mr Kamalasanan replies: “Cyanide ... because it works well with orange juice. I mixed orange juice and gave him.”
He denies Sofia was involved in the crime and had asked him to kill her husband.
He says he believes Ms Sam suspects that her husband had died of a heart attack.
“It’s already published everywhere ... as heart attack,” Mr Kamalasanan says. “They are waiting for the final papers from the Coroner’s.”
Mr Kamalasanan’s representative, Patrick Tehan, QC, told the jury that the taped confession was false.
He told jurors to ask themselves: “Can you be satisfied that the admissions made by Arun to undercover police operatives are true?
“The defence contend they are false, and made in circumstances which would lead you to have real doubts about their truth,” he said.
The tape recording played to the jury on Tuesday, recorded Kamalasanan telling the undercover officer he had “always loved her” but that “she never accepted me”.
“I still love her,” he says.
The trial, before Justice Paul Coghlan, continues.
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Court hears how Sofia and Arun allegedly poisoned sleeping Sam Abraham