West Australian Opposition Leader Mark McGowan has been unanimously backed by his party, leaving Stephen Smith to concede his attempted coup has failed.
WA Labor's shadow cabinet unanimously endorsed Mr McGowan as leader on Monday and he was again backed by his colleagues at a caucus meeting on Tuesday.
Caucus also carried motions that it did not want Mr Smith as leader of the state party and demanded that he unconditionally withdraw his challenge.
The party went as far as demanding Mr Smith rule out becoming WA's opposition leader following Mr McGowan's call on Monday that he "end it forever".
Mr Smith said he fully respected the decision of the party and understood it with "absolute clarity", and he would not challenge Mr McGowan again "between now and the next state election".
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"I will absolutely respect and abide by that decision," he told reporters.
"I absolutely rule out challenging Mark McGowan as leader of the Labor party between now and the next state election."
He said he did not hold a grudge towards those who urged him on as he believed they did so in good faith.
"I made my own decisions, I made my own judgments, I absolutely accept full responsibility for what has occurred," he said.
Mr Smith said he also didn't hold a grudge towards those who made negative remarks about him during the "heat of battle".
The law professor said he would enjoy returning to being a private citizen and resuming "radio silence".
Mr McGowan told reporters he took Mr Smith at his word and held no grudge.
None of his colleagues had admitted being part of the plot, "if there is a plot", and if anyone was wavering, they weren't anymore.
"I think this matter is now over," he said.
"I think it is concluded. I think it is absolutely final."
While he'd take his colleagues at their word, no one who may have conspired against him would be punished if he got the chance to appoint a cabinet after the March 2017 election, Mr McGowan said.
The past few days had shown he was ready to fight, he added.
"When crisis comes along, you either stand up or go on your knees, and I decided to stand up."
He reiterated he was "100 per cent certain" he would lead Labor to the next state election and the party would be "competitive".
"I have a good chance of winning that next election.
"Anyone who assumed that a single person could win an election just because of who they are is wrong."
