Twenty-eight female guards were unfairly dismissed by a security company because the client‚ Metrora.
News of Thami Ngubeni's resignation from O Magazine has sent shock waves through the media industry.
Only a year into her position as editor of O, the Oprah magazine in South Africa, Ngubeni has turned her back on one of the most sought-after positions in magazines.
A statement from Associated Magazines announced yesterday that Ngubeni would be moving on after completing a year as editor.
"Thami has been a great editor and we are glad that her future plans will keep her in close touch with the magazine," Associated Magazines chairman and editor-in-chief of O Jane Raphaely said.
In her letter of resignation, Ngubeni said: "As I come to my first anniversary at O magazine, I, myself, am being met with the challenge to live my best life."
Ngubeni said: "There is nothing sinister about my resignation.
"I am leaving because there are other opportunities that have come from here that I want to explore. But this does not mean I am going to be lost to the O readership. We will maintain the relationship with the magazine.
"We will continue to empower the women of our nation, equipping them with the tools to live the best possible life. So, it's not goodbye."
Ngubeni said she could not announce any details of her plans but confirmed she would be working with some people within the magazine.
Ngubeni, who is also highly respected in the TV world, said the only difference between editing O and her new project was that she would have a greater input in the project on which she has her eye.
"I will be working on various projects, which will mean a change of direction that will benefit me and the magazine," Ngubeni said. "It will also satisfy my personal goals."
She was happy that "the magazine and the readership have grown - advertising has grown".
"The beauty of it is that there are a lot of good, competent people at O," she said. "The brand is very strong. There is no way it will suffer."
Ngubeni leaves her post at the end of June.
Samantha Page takes over as acting editor.