A man licked a bloody knife blade moments after fatally stabbing father-of-two Aaron Hadfield in the chest, a Wellington jury has heard.
Hadfield died from a single stab wound to his heart and lungs on January 26 this year.
Shayd Robinson, 20, has pleaded not guilty to his murder.
The Crown has said Robinson and Hadfield got into an argument over Hadfield's driving and, in a fight, Robinson stabbed Hadfield on the corner of George St and Logie St in Stokes Valley about 8:45pm.
Kerry-Anne Hirini said she saw the argument between Hadfield, Robinson and another man while she was out for a walk.
She said she saw a "frenzy of punches" through the open driver's door window of Hadfield's car by Robinson and yelled at him to get away.
As she approached the car she could see Hadfield was bleeding.
She said Robinson had a knife and as she watched he licked the blade and said something like it was sweet, "Or that he liked it." She said.
She told him to get out and he seemed blank, and would not respond to her.
Hirini tried to help Hadfield who kept saying he wanted to get home to his partner and kids.
Members of Hadfield's family left the court in tears on hearing her evidence.
Robinson's lawyer Mike Antunovic asked if she was sure she saw him lick the knife.
She said she was sure but agreed with him that it could have been that he wiped his sleeve.
Antunovic in a short opening to the jury said it was not in dispute that the knife was Robinson's or that he caused the death of Hadfield, but the jury had to decide whether it was in self-defence.
The Crown says Robinson later boasted to an old friend that he had stabbed someone.
The trial is expected to take two weeks.
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