Tony Worrell has been found guilty of the murder of Katie Powles, 26, who died when his car smashed into hers at Karaka, south of Auckland, on June 3.
He has also been found guilty of grievous bodily harm to another motorist whose car he crashed into and two of four charges of attempted intentional damage.
Tony Worrell, 50, of Swanson in West Auckland, had denied all the charges.
The jury returned a short time ago to ask Justice Andrews two questions.
Justice Pamela Andrews and lawyers were forced into chambers to argue the definition when jurors asked what the meaning of 'intent' was.
Jurors were then instructed not to get caught up on whether it was suicide, but that they need to decide one way or another whether Worrell intended to cause grevious bodily harm.
They then asked what the effect of drugs or a medical condition on intent was. Justice Andrews informed them that a drunken intent can still be intent.
The jury of five men and seven women in the High Court trial at Auckland began their deliberations about 11.20am yesterday.
Just before 1pm today, they told Justice Andrews they were having difficulty reaching a united decision. But Justice Pamela Andrews encouraged them to try again. They have since broken for lunch.
NZPA / 3 News