ONE News has learned no further charges will be laid over the deaths of the Kahui twins.
Counties Manukau police say a comprehensive review has assessed the investigation, trial and more recently the Coroner's inquest and there will be no further charges.
Police have confirmed the twins' father, Chris Kahui, won't come under any more scrutiny.
In July, Coroner Garry Evans found the twins' fatal injuries were inflicted while they were in their father's "sole custody and care", and he has ruled out any involvement from their mother Macsyna King. Kahui's defence had claimed King was responsible for the deaths.
The findings , released following an inquest in 2011, were a new development in a case that started when three-month-old boys Chris and Cru Kahui died from brain injuries in Auckland's Starship Hospital six years ago.
After the family initially refused to co-operate with police in their homicide investigation into the twins' deaths, Kahui, then aged 21, was charged with their murders. He maintained his right to silence throughout the trial and was acquitted by a jury in 2008.
Evans said the twins were injured in the same manner, at the same time and at the hands of the same person. He said in his report: "The evidence given by Chris Kahui was unreliable, conflicting and, on many occasions, untrue."
The case prompted calls for the right to silence to be removed from New Zealand law although Justice Minister Judith Collins has ruled that out.
Despite the Coroner's findings, Kahui could not be tried again for the killing of the twins because of the law at the time but other criminal charges such as failing to provide the necessaries of life were possible.
Kahui rejected outright the findings of the Coroner's Court and again denied any involvement in his sons' deaths.
In a statement at the time Kahui said he objected in the strongest possible terms to the coroner's findings and criticisms of him personally.
Police say they will assess any new information in relation to
the case if it comes to light.