As we previously reported, the Republic of Ireland newspaper printed the now infamous images of the Duchess of Cambridge - which were first published in French Closer magazine - sunbathing topless while on holiday with Prince Williamin Provence, France.
Independent Star, which co-owns the tabloid with Northern & Shell (who publish UK paper The Daily Star) has now released a statement confirming the immediate suspension of Michael O'Kane.
It read: "Independent Star Limited has suspended editor Michael O'Kane with immediate effect, pending an investigation into the circumstances that led to the Irish Daily Star re-publishing pages from the French magazine Closer, which contained images of the Duke and Duchess of Cambridge.
"Independent Star Limited has no further comment pending conclusion of the joint investigation by the newspaper's shareholders."
Newspaper proprietor Richard Desmond also previously announced that he is to pull his funding from the Irish Daily Star, stating he was "angry" by the decision to publish the pics.
O'Kane has tried to defend his actions, stating that Middleton shouldn't be treated differently to any other celeb, claiming: "She's not the future queen of Ireland, so really the only place this is causing fury seems to be in the UK.
"She decides to partially disrobe on a balcony where it can be seen from a public road and she's stunned now, or the Palace are annoyed that people are interested in this."
Sarah Ferguson - former wife of Prince Andrew, Duke of York - has since expressed her sympathy for Kate, after being the subject of a topless picture scandal herself back in 1992.
Fergie told The Daily Mail: "I have total empathy and sympathy for her," she told the Daily Mail. "I have been there and know what it's like.
"Everyone is entitled to privacy. It is a devastating invasion of one's personal inner space. It is deplorable, abhorrent and despicable."
She added: "She is a beautiful young woman doing a great job for the country. Why should she be stripped of that moment with her husband?"
The Royal couple have since requested an injunction to prevent further publication of the topless snaps, and are also expected to file for damages.