A 32-year-old man was arrested in Hamilton today, while a 37-year-old man was arrested on Monday. Both have been charged with murder.
On Sunday two people were arrested in Whāngarei.
A 25-year-old woman has been charged with murder and kidnapping, and a 28-year-old man has been charged with accessory after the fact as well as kidnapping.
In total seven people have now been arrested in connection with Young's death, and all are due to appear in the High Court at Hamilton on Tuesday.
The other three include two women arrested on September 24.
A 20-year-old woman was charged with accessory after the fact to murder, two charges of kidnapping and a further two charges of wounding with intent to cause grievous bodily harm.
A second woman, aged 34, was arrested and charged with manslaughter and kidnapping.
The first person to be arrested and charged with murder was a 24-year-old man on September 19. He was granted interim name suppression when he appeared in court that week.
Young's body was discovered on a rural property in Gordonton on April 13, a month after he was last seen in the Insoll Ave area.
"Police would like to thank all those who provided information and helped to bring these people before the court."