The heartbroken family of a "loveable, knockabout" surfie executed in a campervan while holidaying with his fiancee in remote New Zealand said they are living their "worst nightmare" as police hunt his killer.
A massive manhunt is tonight underway to catch the gunman who shot dead Victorian man, Sean McKinnon,33, at a campground in Raglan, about 165km south of Auckland in the early hours of this morning.
His body was found inside the caravan, dumped a 75-minute drive away in Gordonton about 8am.
His sister, Emmeline, 39, told the Herald Sun she is haunted at the thought of his "terrifying" final moments.
"I feel sheer helplessness. As an older sister I wish I could have been there to defend and protect him," she said.
"It's a horrible thought to know he was alone when he died."
His family, including mother Rhonda, brother and four sisters are tonight flying to New Zealand to aid in the manhunt and bring back his body.
The surfing fanatic and his Canadian fiancee, Bianca Buckley, 32, were asleep in their campervan at the Te Toto Gorge car park in Raglan when they were woken by a stranger at their window.
The man demanded keys to the couple's campervan before McKinnon was shot numerous times.
Buckley, a midwife, ran several kilometres to get help, raising the alarm about 3.20am.
Almost five hours later, Mr McKinnon's body was located inside the white 2017 Toyota Hiace ZL on Puke Road, Gordonton, about 70km northeast from the shooting.
Armed police saturated the Waikato region in search of the gunman.
The shooting is being treated as random.
McKinnon had travelled to New Zealand about a fortnight ago to be with his fiancee, who lived and worked locally.
At the time he was working as a carpenter in remote Tasmania.
"He did everything with a smile," his older sister said.