A 29-year-old man and a 26-year-old man initially faced multiple charges of wounding with intent to cause grievous bodily harm.
In May the pair were jointly charged with murder over the killings.
Corrections told RNZ the 26-year-old man had been granted electronically monitored bail by the court before he died.
Police said the death has been referred to the coroner.
The whānau of the 26-year-old declined to comment.
– RNZ

