The author of an explosive book into the case against Scott Watson says the 44-year-old is a Jekyll and Hyde character.
Ian Wishart's new book labels Scott Watson as the killer, a change from his previous view - and adds that he had an accomplice.
VIDEO: Watch the full interview here
Wishart told Leighton Smith Watson, in an extended interview above, was in fact a predatorial psychopath.
"When he was sober he was a nice guy. When he drank he turned into a monster, and even those closest to him described him like that."
"That's the story of Scott Watson that we haven't actually heard about, because it's been airbrushed."
Wishart said that aspect of Watson's personality has never come to light before because no one had access to the police file until now.
He also claimed there never was a mystery ketch involved in the disappearance of Olivia Hope and Ben Smart.
Talk of Olivia and Ben getting on a mystery ketch when they left a New Years Eve Party in the Marlborough Sounds has long been used in the case for Watson's innocence.
But Wishart argues two passengers on board the water taxi that dropped the pair off described a yacht, similar to Watson's Blade.
"The media publicity about the ketch in the very early days, and Guy Wallace's insistence it was a ketch, coloured people's memories and recollections."
"Nobody wanted to be seen to be out of line with it, so everyone started looking for this ketch, and rethinking and overthinking."
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