Tarawa had to apply the brakes to avoid a collision and beeped the horn.
He then followed Vujcich to Kowhai St where the latter lived.
Both got out of their vehicles and had a verbal argument over the earlier incident near the service station.
Vujcich told his son, who was the front seat passenger in the van, to move their vehicle up the driveway of his house.
While both men were arguing, Tarawa's partner came out and told Vujcich to go and for her partner to "leave it" and to go with her.
Vujcich, 58, then pushed Tarawa in the chest but it didn't move him.
As the woman turned around to walk back to her car after being told to do so by her partner, Tarawa threw a punch at Vujcich which grazed the left side of his head.
He then followed it up with a second punch that connected with his head.
He fell backwards and landed on the concrete footpath unconscious.
Tarawa got into his vehicle and drove away but returned a short time later with his partner and saw police cars at the scene.
He was stopped by police and arrested for the assault.
When emergency services arrived, Vujcich was unconscious and assessed to be in a life-threatening condition.
He had bruises and lacerations, including near his right eye, left shoulder and an indentation at the top of his head.
Vujcich was transported to the Bay of Islands Hospital in Kawakawa where his condition quickly deteriorated and he was placed on a ventilator.
He was taken off the ventilator and passed away at 12pm the next day.
A post mortem found he died from blunt force head injury, including bleeding to the base of the brain stem and large fractures to the skull.
Those injuries were unsurvivable.
