Protesters will show their outrage over the downgraded conviction of wife killer Gerard Baden-Clay at a rally in the Brisbane CBD.

Friends of Allison Baden-Clay will lead the heartfelt call on Friday for Queensland’s attorney general to appeal the shock decision.

Supporting the rally is Queensland senator Glenn Lazarus, and Bruce and Denise Morcombe, the campaigning parents of murdered schoolboy Daniel.

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It comes as a petition urging for the shock decision to be appealed by the government has been signed by more than 100,000 people.

Baden-Clay, who was last year sentenced to life in prison for murdering Allison, had his conviction downgraded to manslaughter on appeal earlier this month, sparking community anger.

“We need women, men and children to show that domestic violence must stop. We need to let our political leaders know the social and legal structures designed to support and protect against domestic violence are not working,” a Facebook page for the event says.

Queensland’s premier has urged people to be patient as the state’s Director of Public Prosecutions (DPP) considers an appeal.

“This matter is an extremely emotional issue for many people across our state,” Premier Annastacia Palaszczuk said on Thursday.

“But I want to reassure the Queensland public that the DPP is examining this issue in detail.

“I know I’m asking Queenslanders and the public – the families out there – to be patient, but we have to let the DPP do its job.”

The rally will begin at 12.15pm in Brisbane’s King George Square.