Lecretia Seales and her family were informed of the decision on her plea to be allowed to take her own life, with the assistance of a doctor, on Tuesday.
ONE News understands the different parties involved in the case learnt of the decision on Tuesday, and received Justice Collins' written decision yesterday.
Ms Seales, a Wellington lawyer, died today after battling brain cancer for four years.
Earlier this year Ms Seales went to the High Court to try and gain the right for her doctor the right to euthanise her without fear of prosecution under the Crimes Act , in the event her final days became unbearable to her.
The High Court judgment is expected to be released to the public this afternoon.
Today, emotional tributes have been paid to Ms Seales.
Since news of Ms Seales death this morning became public hundreds of people have left tributes to the 42-year-old on the ONE News Facebook page.
Robyn Booysen wrote: "Sad news RIP now beautiful lady, my thoughts and prayers are with her family."
Anna Kerr wrote: "RIP Lecretia and my condolences to your family and friends you fought a brave fight god speed."
Other ONE News readers paid tribute to Ms Seales' bravery in taking her fight over euthanasia to the High Court.
Rhonda Smith wrote: "RIP Lecretia you were an incredibly strong lady. My heart goes out to her husband and family and my hopes are that the judge has changed the law to some degree to help the terminally ill."
Former New Zealand Prime Minister Sir Geoffrey Palmer also wrote a heartfelt tribute for Ms Seales. The pair worked together at Sir Geoffrey's law firm Chen & Palmer and then at the Law Commission.
"Lecretia has got to be one of finest human beings I have ever met," Sir Geoffrey wrote on Ms Seales' and her husband Matt Vickers' blog.
"She never sought the spotlight. And she is extraordinarily taciturn. But deep down there is a person of great compassion, empathy and judgment."
A grieving Mr Vickers wrote on the blog "I am unable to express my feelings right now."
Care Alliance, a group made up of medical and religious organisations against doctor-assisted dying also paid also tribute.
"We send our deepest condolences to her family and friends at this time. Even though we had opposing views, we always had the upmost respect for her strength and skill and the way she's presented her arguments," said Matthew Jansen, Care Alliance Spokesperson.