Police have now laid further charges against two of those people.
A 25-year-old man has been charged with the murder of Maangi, and a 28-year-old man has been charged with party to murder.
Eastern District criminal investigations manager Detective Inspector Marty James said he appreciated all those involved in the investigation.
“I commend the team for all their hard work throughout this investigation and would also like to thank the public who responded to our appeals and assisted with necessary information,” James said.
“While this does not change the devastating loss that Mr Maangi’s family are coping with, I hope that holding these people to account will bring them some sort of closure.”
Both men are due to appear in Gisborne District Court on March 27.