He appeared in Hutt Valley District Court today charged with unlawful possession of a firearm and burglary.
Both men have been remanded in custody and Mr Bohm said further charges were likely.
Police were also investigating how the man had suffered knife wounds, but no-one had been charged in relation to this.
There were a number of gang members in the community where the attack occurred and this would form part of the police's investigation, Mr Bohm said.
Detective Senior Sergeant Dave Thornton said police were not seeking any one else in connection to Mr Matalasi's death.
"The two men connected with this incident have been arrested by police and put before the courts. Police are not seeking anyone else in relation to this inquiry.'
Anyone with any information about what happened should contact Hutt Valley Police on (04) 560 2600 or Crimestoppers anonymously on 0800 555 111.