"Scared" Mongrel Mob members would rather run away than help solve the death of their friend, police say.
Sio Matalasi, 25, was shot dead outside his flat in Jackson St, Petone, on August 22 after friends of his, from the Mongrel Mob Petone chapter, clashed with Mongrel Mob Rogue members from Porirua.
Following a plea from his fiancee Maiana Kerehoma for the community to speak up, police have also called for Matalasi's friends to give evidence to help convict his killer or killers.
"There's six people who we are interested in speaking to," Detective Senior Sergeant David Thornton said.
"We've made attempts to speak to them but at this stage they've refused to make statements to us. Those people are the crucial eyewitnesses who can tell us exactly what happened.
"These guys are frightened of the Rogue chapter. They're too scared to come forward and make statements to police. They're being disloyal to their friend."
He said some Mongrel Mob members had actually run away from police and refused to answer the door.
The six friends of Mr Matalasi - patched gang members and gang associates - were involved in the confrontation preceding his death.
The stoush between the rival gang chapters involved a gun, a machete and a cricket bat, police say. One of the Rogue gangsters was left with machete slashes to his head and arm and Mr Matalasi was killed by a gunshot wound.
"We are aware that members of the Rogue chapter in Porirua have come to the Jackson St flats to 'tax' another Mongrel Mob member from Petone, which has led to this altercation."
Matalasi was not a gang member, police say, but had been socialising with them the night he was killed.
He was shot three weeks before his second child was expected to be born and just two days before his other son's first birthday.
"It's difficult to understand why these Mob members won't support their friend Sio. They lack the moral courage to stand up and do what's right."
Last month, Kerehoma signed a letter distributed through her neighbourhood calling for the friends to speak.
The Rogue chapter had a reputation even among the Mongrel Mob gang for "more extreme behaviour", Mr Thornton said.
Dillin Pakai, 19, and Shane Pierre Harrison, 43, have been charged with unlawful possession of a .22 pistol, recklessly discharging a firearm and burglary of a Jackson St flat, as police investigate the homicide.
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