A woman who witnessed a motorist being killed in a suspected road rage incident in Lower Hutt can't forget his look of bewilderment as he realised he had been stabbed.

Father-of-two Aaron Anthony Hadfield, from Stokes Valley, died on Thursday night.

Two men, aged 20 and 22, handed themselves into police and have been charged with assault. Police said further charges were pending.

Jill Rua watched from the window of her George St house. "I saw the car stopped in the middle of the street and I heard a lot of swearing. Then I thought they had a fight - that the guy was punching him. I didn't realise he was stabbing him."

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The driver got out, clutching his chest. "He looked like he was really bewildered, like he couldn't believe he'd been stabbed, I can't forget it.

"He looked dizzy ... and then he fell over on to the grass verge."

Several people rushed to his aid but he died on the way to hospital.

Detective Senior Sergeant Scott Cooper said police were looking for a knife, thought to have a blade 7cm to 10cm long, possibly with a wooden handle.

"We are still very keen to hear from anyone who may be able to provide any information to police."

The accused were both granted name suppression in Lower Hutt District Court when they were remanded in custody until an appearance due next month. APNZ