Hell hath no fury like a lover scorned.

The lawyer for a woman accused of killing her husband told a jury her rejection of her lover drove him into a rage that resulted in murder.

Amandeep Kaur, 32, is on trial before the High Court at Auckland accused of the murder of her husband, 35-year-old Davender Singh, who had his throat slit as they sat in their vehicle on the side of a south Auckland road on August 7 last year.

Kaur's lover, 27-year-old Gurjinder Singh, with whom she had an affair in the preceding months, is jointly charged.

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Defence lawyer John Anderson said his client conceded it had been a very passionate affair and that she agreed with a plot to kill.

Unlike Gurjinder Singh, she completely admits being part of a plan to kill her husband, he said.

Being in love and subject to domestic violence, she joined in his plan.But the day before the slaying she broke things off with Gurjinder Singh, telling him verbally and through a handwritten letter that it was all off, Mr Anderson said.

Kaur and Davender Singh had reconciled, even attending the Sikh temple in Takanini and praying for their marriage in front of a priest that evening.

Mr Anderson said the spurned lover had not taken rejection well.

Gurjinder Singh became determined to kill Davender Singh regardless, perhaps in the belief that if he could not have Amandeep he could prevent Davender from having her, he said.

On the night of the incident, Kaur and her husband pulled over on Norman Spencer Drive to talk, a practice they adopted because of a lack of privacy at home.

But Gurjinder Singh had followed them, Mr Anderson told the jury.

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An argument between the men erupted and while Kaur looked away, her co-accused allegedly pulled out a knife and repeatedly stabbed and slashed the victim.

The post-mortem photographs show a frenzied attack, said the lawyer.

According to Kaur, her lover tried to entice her into stabbing Davender Singh too but she declined.

As he left the scene, she tried to stem the blood flow by putting her hands around her husband's neck, Mr Anderson said.

So why did Kaur not immediately tell police she knew the identity of the killer?

In particular because of the affair and the shame attached to that, her lawyer said.

She did not want to reveal their relationship and therefore disrespect the victim's memory, he explained.

Mr Anderson said at the time of the attack she had legally withdrawn from the plan to kill and must accordingly be found not guilty.

Kaur is expected to spend the rest of the week in the witness box.

Gurjinder Singh, who spent the last two-and-a-half days giving evidence, had a different account of events.

He told the court it was his co-defendant that was the driving force behind getting rid of Davender Singh and when he arrived at the scene on August 7, 2014, on a whim, Kaur had already killed him.

Accused claims love was fleeting

Gurjinder Singh said his affair with his co-accused Amandeep Kaur was fleeting and he was not planning to leave his wife for her.

Both defendants admitted they had had an affair in the months leading up to the incident but it had stopped a few weeks before the death when Gurjinder Singh's wife discovered - through intimate Facebook messages - what had been going on.

While being cross-examined by Crown prosecutor Natalie Walker this morning, Gurjinder Singh said he had only had sex with Kaur once.

Earlier in the trial the court heard the pair had taken a day off work together and spent three or four hours at Allenby Park Hotel.

Electronic messages between the defendants, from a month before the alleged murder, were read to the court.

"I love you and miss you, hehe," Gurjinder Singh sent.

"Ok, kiss me please... did you like my massage?" Kaur replied.

Ms Walker suggested the pair were "very much in love" and Gurjinder Singh admitted it was "very intense".

"When you weren't together you wanted to be together," she said.

But Gurjinder Singh said it was only sex he was interested in, rather than leaving his wife for Kaur.

After initially telling the jury the affair did not constitute a lie to his wife because she did not ask about it, he later accepted it was a "deception".

Dozens of secret handwritten notes between the defendants were found by police in the days after the alleged murder, which the Crown said shed light on a plot to kill.

But Gurjinder Singh said there was no reason for him to kill Davender Singh.

"I could have told Amandeep to call police and get them to take him away. He was beating her every day," he told the court.

He said it may have been a different scenario in India but domestic violence was taken seriously in New Zealand.

Gurjinder Singh has now spent nearly two and a half days in the witness box.

Later today it is expected Kaur will have to make a decision whether she too will elect to give evidence.

The trial continues.