Radio host Jackie O has filed legal proceedings against radio network ARN, claiming compensation of at least $82.25 million and alleging that her termination was against the Fair Work Act.

In a notice to shareholders this morning, ARN said it disputed Jackie “O” Henderson’s claims and will defend against the suit in court.

It is the latest salvo in the ongoing feud between the network and its once highest-rating program, the Kyle and Jackie O show.

Jackie ‘O’ Henderson has launched legal action. (WireImage)

The announcement comes after Henderson’s long-time colleague, Kyle Sandilands, launched his own lawsuit against ARN after his contract was terminated.

The duo, who dominated Sydney radio ratings for years, saw their audience fall in a much-touted move to Melbourne more recently.

The co-hosts fell out after an on-air argument on February 20, after which Henderson reportedly declared she was unable to work with Sandilands.

The co-hosts fell out after an on-air argument on February 20. (Nine)

Both of their contracts were ultimately torn up and the show was cancelled.

In its statement to shareholders, ARN said Henderson also accused the company of making “misleading and deceptive” market statements, a claim ARN also denies.

The proceedings have been filed in the Federal Court, where Sandilands’ own lawsuit against his former employer was first heard last Friday.

Sandilands revealed his contract had been terminated on March 18, less than an hour before ARN Media confirmed the news in a market announcement published on the Australian Stock Exchange.

Sandilands and Henderson have been on air together for more than 25 years. (Instagram/Jackie O)

“ARN Media advises that it has issued a notice of termination of contract to Mr Kyle Sandilands and Quasar Media Services Pty Ltd,” the statement said.

“As a result, the Kyle and Jackie O show will no longer be presented.”

Sandilands said he had apologised to Henderson the night after the on-air argument but claimed ARN had used the rift to “burn the place down”.

Details of the on-air blow-up that derailed Kyle and Jackie O’s $200 million deal

The on-air fight began after Jackie O read from Andrew Mountbatten-Windsor’s astrology birth chart and Sandilands complained about her interest in astrology charts.

“Your fixation on this has made you almost unworkable,” Sandilands told her.

“You are off with the fairies with this s—, it’s mental.”

Jackie O Henderson on Her Best Life (Spotify/ Her Best Life)

He claimed her fixation on astrology charts made her sound like a “drug addict”.

Henderson has previously opened up on air about addiction issues that led to her going to rehabilitation in the US in 2022.

Henderson said Sandiland’s accusations were “so unfair” and that he was attacking her on air.

“I would never say things like that about you,” she said.

Kyle Sandilands says he has a “mortgage to pay like everyone else” as he chases $85 million from his former employer in the Federal Court. (A Current Affair)

“It’s a total attack, it really is. Kyle, to say ‘you don’t know what the F is going on, you’re not doing your job,’ that’s an attack and I wouldn’t do that.”

Sandilands and Henderson have been in an on-air partnership for 27 years.

They moved to breakfast in 2005 and then to KIIS in 2014.

They have been under contract in a lucrative $200 million, 10-year deal that was set to run until December 2034.

Full statement from ARN Media regarding Jackie O’s lawsuit

ARN Media Limited [ASX: A1N] announces that Ms Jacqueline Henderson and her related company have commenced legal proceedings against ARN.

The proceedings have been filed in the Federal Court against Commonwealth Broadcasting Corporation Pty Ltd (CBC), a subsidiary of ARN which is the licence holder for KIIS 1065 Sydney and contracted with Ms Henderson and her services company. Unsealed copies of Court documents in respect of the proceedings were served on CBC on 30 March 2026 after market close.

In summary, the applicants claim that the termination of Ms Henderson’s contract constituted adverse action. Ms Henderson sent a ‘Complaint Letter’ to CBC which noted that Ms Henderson “cannot continue to work with Mr Kyle Sandilands” and made psychosocial health and safety and bullying complaints in relation to the conduct of Mr Kyle Sandilands on and prior to 20 February 2026. It is alleged that the Complaint Letter involved the exercise or proposal to exercise workplace rights, and that the contract was terminated because of that exercise or proposed exercise, in alleged contravention of section 340 of the Fair Work Act 2009 (Cth). It is also alleged the termination of her contract amounted to a repudiation of that agreement.

The applicants also claim that ARN’s ASX Market announcement of 3 March 2026 included misleading and deceptive statements under the Australian Consumer Law. The applicants claim compensation of ‘at least $82,250,000’, and payment of a pecuniary penalty, plus interest and costs.

ARN disputes the claims. It intends to defend the proceedings. Given the early stage of the matter, ARN is unable to reliably estimate the outcome or any potential financial impact.