About 40 people gathered outside Parliament this afternoon, calling for another look at the Scott Watson case.

Watson has been serving a life sentence since 1999 for the murders of Ben Smart and Olivia Hope.

Watson's father, Chris Watson, joined the peaceful protesters today, and said people are particularly upset over evidence surrounding the boat Hope and Smart were last seen on.

LISTEN ABOVE: Chris Watson speaks with Larry Williams

"A lot of people are contacting Scott's lawyers, angry that their evidence was disregarded," he said.

Chris Watson said the recent documentary Doubt seems to have struck a chord with people.

"I think there will be a result, because nobody's forgetting."

He said the case has attracted a whole new generation that are unhappy with the way the case was carried out.