In the weeks before the killing, the defendants exchanged dozens of secret handwritten notes, which the Crown says crystallised the plot to commit murder.
But Gurjinder Singh denied having anything to do with such a plan and when he arrived at the scene on Norman Spencer Drive, he said Davender Singh was already fatally wounded.
"I saw Davender was breathing with a lot of difficulty and there was blood flowing out of his mouth and there was blood all over the front of his body. I just saw him once, I did not look at him twice," he told the jury.
He said Kaur explained to him she had "just got angry".
Today, Kaur's lawyer, Sanjay Patel, in cross-examination put it to Gurjinder Singh that he was the one behind the plot to kill.
"You hatched a plan to get rid of Davender ... and you did that, I suggest, so you and the woman you loved, and the woman you were infatuated with, could be together," he said.
The defendant vehemently denied any such plan.
"From day one I had tried my level best to explain to him everything between us is finished," he said.
Mr Patel explained he was giving his client's side of the story.
"Didn't you say you were going to take care of him and then ran your finger across your neck in a throat-slitting gesture?" the lawyer said.
"I've never said anything like that," Gurjinder Singh replied.
Mr Patel said there had been two plans.
The first was for the man to kill Kaur's husband when he picked her up from work and then dump his body and car.
The second was for the defendant to follow the couple in their car after work and then strike when they pulled over, which he said was remarkably similar to what allegedly took place.
Gurjinder Singh reiterated his innocence and said the three or four notes referring to killing Davender Singh were all written by Kaur.
The Crown will also have a chance to cross-examine the defendant.
