The Democratic Alliance (DA) has announced that its Federal Executive resolved last night to endorse the finding of its Federal Legal Commission that Cape Town mayor Patricia de Lille's membership had ceased as of 26 April.
After weeks of confusion and public spats between the Cape Town mayor and the party's leadership it was an interview on the Eusebius McKaiser Show that sealed her fate.
But Natasha Mazzone, deputy chair of the DA federal council, said a charge was brought against De Lille in terms of section 188.8.131.52 of the DA's constitution.
The mayor has been accused by the party of a rash of allegations, including misconduct.
Quoting a transcript of the interview, De Lille said: "Secondly, the meaning of my statement is very clear: I will not resign until I have proven through the Party's disciplinary processes and, if necessary, by court proceedings that I have done nothing wrong".
The mayor of Cape Town, South Africa's second largest city, was ousted by her own party on Tuesday after her administration came under fire over mismanagement and alleged corruption.
"I am ready to continue this fight; now it has become clear that there has always been a predetermined outcome from all the party's proceedings against me. I'm representing the DA, and if the DA feels that it wants to put someone else in that position, it is also entitled to do that".
"The implications of the De Lille action are far wider and likely to be more impactful than just the elections next year".More news: Woman says she was repeatedly sexually assaulted at singer Chris Brown's home
The basis of this "intention to resign" stems from an interview De Lille gave on Radio 702 with Eusebius McKaiser.
"I will be, on Friday, going to court to seek leave to appeal the party's decision", said De Lille.
This clause states that, if a member publicly declares his or her intention to resign, then the person's membership ceases immediately.
"The party is deeply concerned about the impact this has had on the residents of Cape Town - the people we serve - and the general public".
"I have been made aware that the deputy mayor [Ian Neilson] has already held meetings with the staff in my office", said De Lille.
"This means she has lost her seat as a councillor and is therefore no longer the executive mayor of Cape Town, with immediate effect", said Neilson.
However, while this was happening, De Lille's lawyers were busy serving and filing court papers.