On the day of the attack, Nuku drove with his niece from Hastings to Napier and stopped after seeing the mother's vehicle parked outside the dairy.
Nuku parked in nearby Chambers St and walked about 80-100 metres towards his former partner's vehicle, saw her at the wheel, opened the front passenger door and lunged across the vehicle's interior, repeatedly stabbing the woman. The vehicle was seen in CCTV images to be rocking as the blows continued for about 40 seconds.
At least 15 wounds to the torso and neck were inflicted before Nuku stopped as the woman opened her door and fell on to the road.
Passersby went to her aid as Nuku ran off and fled the area in the vehicle he had arrived in, while the injured woman was rushed to hospital in Hastings, where she remained in the Intensive Care Unit for several days, undergoing two surgeries.
Nuku was found two days later hiding in the boot of a vehicle driven by a girlfriend, and was heard to say to a friend who approached a police vehicle as he waited after being arrested: "I was out driving with my niece and I saw her, I just lost it, I snapped."
Although admitting to police that he had stabbed the woman, he said he had not taken a knife to the scene and the weapon was a knife he had taken off the woman.