In his first public appearance since his exoneration for murder three years ago, David Bain drew tears from the audience.
Mr Bain spoke at the inaugural International Justice Conference in Perth, in front of forensic experts, justice advocates and lawyers.
Mr Bain was convicted of the murder in 1994 of his parents, Margaret and Robin Bain, and siblings, Arawa, Laniet and Stephen, at their Dunedin home. He was then acquitted in a retrial in 2009 after 13 years in jail.
The Australian conference was billed as a world-first gathering of forensic experts, lawyers and justice advocates.
The 41-year-old told his story alongside his long-time supporter, Joe Karam.
Mr Bain's voice faltered when he recalled finding his brother Stephen covered in blood and curled up in his bedroom.
Speaking after the conference, Mr Bain said he still saw a counsellor to deal with his 18-year ordeal.
"When you have lived with an emotional pain, after a time, it's something that is just bearable.You can carry it. It's not actually coping, it's just functioning."
Mr Karam also gave a short address, and was moved to tears after Mr Bain's speech, saying he was just "so proud".
Although he is trying to live a normal "average" life, Mr Bain said the memories of his dead loved ones still haunted him.
"For me it's not a dream, it's a waking nightmare and I've got to voluntarily talk about it.
"Every time I talk to the counsellor, every time I talk to Joe or my lawyers, I have to relive that nightmare."
Mr Bain's address began with photos from his childhood. He spoke of playgrounds, abseiling, swimming, outdoor activities.
He then described his father as strong, stoic, capable and respected in the community.
His mother, he said, was artistic and musical, and when he was 16 and was skinny and had acne, his mother became his friend and confidante.
He described his family members, while showing photos of them.
However, when they moved from Papua New Guinea to New Zealand, cracks started to show. His father found it difficult to find a job, and did not like his job. His parents ended up separating and for four years his father lived in a caravan behind the property.
On Sunday, June 19, 1994, the family sat together and watched a movie, and ate fish and chips.
Estranged sister Laniet was staying for the weekend. He was woken in the night by loud arguments and thinks his mother left for a time but then came back. Mr Bain did his paper round the next morning.
Mr Bain came back and saw his mother's light was on, and thought she was awake. He went upstairs and found an open packet of bullets in his room and his rifle gone.
He went to his mother's room and saw her propped up on pillows.
Then he pulled the curtains back and saw blood streaming down her face and realised she was dead.
After that, he said, he blacked out and he has marginal recall.
His voice faltered when he recalled seeing Stephen curled up on the floor.
One of his sisters was bent into an unnatural position. There was blood all over Stephen's room. He felt confused, was blacking out, could not focus and was having random thoughts such as "I need to hang the washing out" and "I need to do my university essay".
The next few days cut him "to the core". He had to undergo a full medical strip search.
Mr Bain's sadness turned to anger when he discussed the way he was treated during his first trial.
"They systematically destroyed my family's and my reputation. Everything I said fell on deaf ears."
He described the justice system as a "creature without compassion".
In one of the police interviews during his trial, he was told: "Either it was your father or it was you." When he finally asked for a lawyer, he was told: "Congratulations David, you're now a criminal."
Mr Bain says of his future: "I do hope for as normal a life as I can possibly get. Working, dealing with everyday normal things like paying bills. It's like Joe said, I'm average."
