Appalled, shocked and sick to her stomach, Premier Annastacia Palaszczuk announced she had made the decision which may cost her government, just two months after coming to power.
Ms Palaszczuk wasted no time on Sunday announcing she had asked Labor state secretary Evan Moorhead to expel Cook MP Billy Gordon over his failure to disclose elements of his past, including criminal convictions.
She said she made the only decision she could and had advised him to resign, which could spark a byelection in the north Queensland seat.
Given Labor holds power only through the support of independent MP Peter Wellington, the decision could cost Ms Palaszczuk government.
Mr Gordon said he was was considering his future and would consult with lawyers, family and supporters before making a decision.
"I am presently weighing up my options after the advice I have received from the Premier that she has asked for my expulsion from the Labor Party," he said in a statement.
"I am very concerned that I should be afforded natural justice in any determination that my tenure as the Member for Cook should be terminated because of her move to see me expelled from the Labor Party and her wish for me to resign as a Member of Parliament.
"The Premier has previously requested that the Police Commissioner investigate whether I have transgressed any law and that process should be allowed to continue its natural course.
"Any other attempt to remove me from the Parliament and force me to resign is a denial of natural justice."
Mr Gordon said he would have eye surgery on Monday and that he was concerned about the impact the situation was having on his children.
"The member for Cook has let me down. He has let the Deputy Premier down, he has let the party down, he has let my government down, he has let the people of Queensland down," Ms Palaszczuk told media in Townsville just after noon, speaking without notes.
"I have always maintained integrity is fundamental to any government I lead. Today I am prepared to put my premiership on the line.
"This is a very serious issue. Just half an hour ago, I spoke to the member for Cook. I told him, very clearly that, today I would be writing to the state secretary to expel him from the state Labor Party.
"Secondly, I told the member for Cook he would not be sitting with the state Labor parliamentary team.
"I also told the member for Cook, in the best interests of the party, in the best interests of the Parliament and in the best interests of Queensland, he should resign as a member of Parliament.
"As you can appreciate, it is one of the toughest calls I have had to make.
"I did not enjoy making that call, and I think everybody would appreciate that the member for Cook is extremely upset at the moment and I have asked the State Secretary, Evan Moorhead, to provide the necessary supports around the member for Cook during this very difficult time."
Ms Palaszczuk said she believed in the principles of integrity former Labor leader Wayne Goss had advocated and could do nothing less.
"Let me come back to the central issue," she said.
"The member for Cook was dishonest with me.
"He has let me down, he has let my deputy down, he has let my team down and he has let the people of Queensland down.
"The non-disclosure, to look me in the face and be dishonest - there is no second chance.
"And I believe the most honourable thing for the member for Cook to do now is to resign."
Mr Gordon came to prominence on Friday when it was revealed he had not paid child support to his former partner and mother of his two children, having actively failed to lodge tax returns to avoid doing so.
Ms Palaszczuk said then she had ordered Mr Gordon to "get your house in order", but believed after a discussion with him that there were no other issues.
But a letter sent to Ms Palaszczuk and several other MPs from Mr Gordon's ex-partner asking for help with recouping her child support also contained allegations of domestic violence. On Friday evening, after a website linked to former LNP MP Gavin King published the allegations, Ms Palaszczuk referred the matter to police.
A crisis meeting was called by Labor heavyweights on Saturday, where Mr Gordon was asked to disclose any further issues.
On Sunday, Mr Gordon's criminal record was made public, which he had not disclosed to the party during the preselection or when he first spoke to Ms Palaszczuk and Deputy Premier Jackie Trad following the child support claims.
Leaving the press conference to applause, Ms Palaszczuk said she would "get on with the job" of governing Queensland and would let the chips land where they fall.
"We will continue to work hard each and every day," she said.
"But when it comes to integrity and accountability, I will always stand up for my principles and the prinicples my government adheres to, even if it means putting my premiership on the line. Because I have campaigned on integrity and accountability, I have modelled myself in the tradition of Wayne Goss and his stance on integrity and accountability and I will not put that to one side for one single moment.
"For one single moment, I will not put that aside."
Ms Palaszczuk's decision to sack Mr Gordon from the ALP came 30 minutes after Deputy Opposition Leader John Paul Langbroek challenged the Premier to release all correspondence discussing the allegations.
Mr Langbroek said Ms Palaszczuk had credibility issues she must deal with.
"It is important that, while Billy Gordon may have character issues to deal with, Annastacia Palaszczuk has credibility issues," Mr Langbroek said.
He said the Premier did not on Friday " 'fess up" to the people of Queensland in Parliament when Mr Gordon's issue were raised.
"It is important for the people of Queensland to know when did the Premier first know about these allegations, what did she do about them," he said.
"And importantly, why didn't she do something earlier."
Ms Palaszczuk on Friday referred allegations to police of Mr Gordon abusing a former partner from a relationship a decade ago.
Mr Langbroek said the newer allegations, revealed by Mr Gordon after a meeting with senior ALP figures, raised questions about Ms Palaszczuk's leadership.
"We would like to know the whole email trail; when did the Premier and other ministers know about these allegations, what did they do about them, and importantly, why didn't they do something earlier."
In 2013,Mr Gordon also stood as Labor's federal candidate for the seat of Leichhardt in the federal election, polling 44.3 per cent of the vote, behind the LNP's Warren Entsch.
Mr Langbroek said Labor's candidate recruitment issues were a matter for the ALP.
