Justin Richard Burke, 33, had denied killing Shayne George Heappey, 25, during a brutal attack where he was stabbed and cut 14 times in December 2018.
This afternoon, after a two-week trial at the High Court in Christchurch, a jury returned its verdicts.
Burke was found not guilty on the charge of murder.
But they found him guilty on a charge of manslaughter.
There were gasps from the public gallery when the verdicts were returned.
Justice Rob Osborne gave him a three-strike warning and remanded him in custody to be sentenced on February 10.
The court earlier heard how Heappey, known as "Smiley", had ignored repeated requests to settle a $300 debt and turn over a stolen Subaru car to the Nomads' Christchurch chapter president's daughter.
Burke admitted knowing the gang's plan to give Heappey a hiding.
But he claimed he didn't know that 31-year-old gangland enforcer Matthew Winara Webber had a knife and that he was going to stab him.
After the attack, Heappey was bundled into a car and driven to Christchurch Hospital where he would soon die from his injuries.
Heappey knew he'd done wrong by the gang and was waiting to receive his punishment on December 8, 2018.
He owed $300 for a drug debt to Leone Sherie Cook – the 28-year-old stepdaughter of Nomads Christchurch chapter president Randall Clinton Waho.
She also wanted a stolen car that Heappey had been driving around in handed over to her and asked her stepfather to get involved.
Waho, 47, set up several meetings with Heappey, the court heard, but he never showed up.
That was a slight against the gang and its president, the Crown said.
The Crown said Burke had only been in town for a month but had started a relationship with Cook and was aspiring to join the Nomads and become a patched member.
Cellphone records and text data shows the gang wanted to put Heappey in his place and Waho had allegedly ordered a hiding – and Heappey knew it.
Webber, with his propensity for violence, was known as the gang enforcer, the jury was told.
On the day the gang finally tracked Heappey down, Burke was with Webber when they knocked on a door in Russley and told Heappey to come outside.
A neighbour, the Crown said, heard a man saying: "Come here, it's all right. I'm not going to hurt you."
Another neighbour heard fighting.
After the assault, Burke fled to Dunedin where police caught up with him days later.
The Crown claimed Burke – who wanted to be patched up - must have at least known Webber had a knife that day.
