Auckland, Nov 6 NZPA - A man injured when Tony Worrell deliberately drove his car into his vehicle says he will never have a satisfactory answer as to why the incident happened.

A jury today found Worrell guilty of murder after he deliberately killed a woman by driving his car into hers earlier this year.

The 50-year-old, of Swanson in West Auckland, was found guilty of four charges -- murder, causing grievous bodily harm and two charges of attempted intentional damage.

He was found not guilty of two further charges of attempted intentional damage.

All were majority verdicts.

Worrell broke down in tears as the verdicts were delivered. He was remanded in custody until sentencing at the High Court in Auckland on December 18.

Katie Powles, 26, died when Worrell's car struck her vehicle in Karaka, south of Auckland, on June 3. Brett Robinson, who was driving another car, was also seriously injured.

During the trial in the High Court at Auckland, the Crown argued Worrell deliberately drove his car at speed into two other vehicles.

But Matthew Goodwin, defending Worrell, said he "did not have suicide on his mind that night".

Brett Robinson spoke on behalf of his and the Powles' family outside court, who he said had been brought together by a "tragic and unnecessary" event that had caused grief beyond comprehension.

"Our frustration is magnified at the knowledge that we should not be here. This event was avoidable.

"Yet through the selfish act of one person, the impact on our lives has and continues to be significant.

"As victims of this senseless act of selfishness, we are left asking ourselves `why'?, and realising there is and never will be an answer that can provide comfort," Mr Robinson said.

The only consolation he and Ms Powles' family had was that through the "tragic event", two separate families had come together to support each other with love.

He added that both families would try to move forward with their lives in "constant remembrance".

Detective Inspector Mark Gutry said police were pleased with the verdicts.

"We're very pleased for the family. It's obviously been a tough time for them.

"They were certainly relieved, as this was just another step in the process for them," Mr Gutry said.

Defence lawyer Matthew Goodwin said he was "very disappointed" with the verdicts, particularly on the murder charge.

Worrell had repeatedly shown his remorse throughout, Mr Goodwin said.

"He's always deeply regretted that he was driving that night.

"Obviously, it's probably of little comfort to the families to hear that, but he does want it to be known that he's truly sorry," he added.

Worrell was "very disappointed, upset and emotional " about the verdicts.

Mr Goodwin said he would possibly consider an appeal, but that would not be addressed until after sentencing next month.

There had been discussion about whether Worrell would write a letter to the families, and Mr Goodwin said he had spoken to police about whether it was appropriate.

A letter may be sent to the judge which could then be copied to the families, he said.

"There is concern about how the families would react in receiving a letter directly," Mr Goodwin said.