Hemi Rapata Meihana Cahill, 30, pleaded not guilty to being a party to Lui's murder, and assault using a motor vehicle as a weapon at the start of a trial which lasted six days.
The trial before Justice Christine Grice concluded on Wednesday.
The jury found Cahill guilty of the assault, but could not agree on a verdict for the murder charge. Cahill earlier pleaded guilty to the aggravated robbery of Lui's patch.
The trial jury was told that Cahill's associate, Belmont Sonny Freedom Eruiti Te Aonui-Tawhai, 23, has separately pleaded guilty to murder, aggravated robbery and assault with a weapon.
Both men will appear before the court again next month.