About 40 people called for another look at the Scott Watson murder case in a protest at Parliament today.

They claim their evidence was disregarded in the case and have been in touch with his lawyers.

Watson's father, Chris Watson, joined the peaceful protesters, who included justice campainer Arthur Allan Thomas, who received a royal pardon for murder.

He said the recent documentary Doubt seemed to have struck a chord with people.

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Chris Watson said people were particularly upset over evidence about the boat Olivia Hope and Ben Smart were last seen on.