Kyle Sandilands allegedly told co-host Jackie 'O' Henderson to 'get your f***ing s**t together' or 'don't f***ing bother coming back' in explosive off-air tirade

Shock new details have emerged about the explosive fallout between radio king Kyle Sandilands and his longtime co-host Jackie 'O' Henderson, with court documents alleging he told her to 'get your f***ing s**t together' or 'don't f***ing bother coming back'.

The alleged outburst took place during a fiery off‑air clash months before the pair's infamous on‑air bust‑up - the clash that ultimately brought their hit breakfast show crashing down.

According to documents filed in the Federal Court late Tuesday, the confrontation unfolded at KIIS FM's Sydney studios following an incident broadcast on air last year.

The Commonwealth Broadcasting Corporation (CBC), a subsidiary of ARN Media that runs KIIS FM, has lifted the lid on the previously unreported row - the latest twist in its legal war with its former stars.

Sandilands, 54, and Henderson, 51, are both suing the broadcaster for wrongful termination, while CBC is fighting back, accusing the duo of triggering major financial losses after their ratings‑leading show imploded following another on‑air stoush in February.

According to the court documents, the once rock‑solid friendship - forged over more than 20 years on air - had already fractured months earlier, with a massive behind‑the‑scenes blow‑up in September last year.

CBC alleges Sandilands spoke 'contemptuously' to Henderson during an on‑air argument - an incident she has also cited in her statement of claim against the network.

But the argument didn't stop when the microphones were switched off.

'Kyle, that's a bit rough, like f***en hell, I haven't done anything to f***en cop it,' Henderson is alleged to have said, according to CBC's defence documents.

Sandilands is then claimed to have fired back: 'You wanna know the truth, here's the truth. Today's the first day you've ever paid any attention or had to carry anything in the opener, and it's all s**t.'

The documents allege the exchange deteriorated further, with the pair telling each other 'f**k you'.

Sandilands is then alleged to have doubled down, accusing Henderson of being 'too much of a mother hen' and not focused enough on the show.

'Don't f***ing bother coming back either until you get your f***ing s**t together like a normal person,' he is alleged to have said.

According to the defence documents, Sandilands claimed he had been 'carrying this whole show for a f***ing year', complaining that every time he raised concerns, 'newsreader Brooklyn Ross and others said nothing'.

'I'm just left here with a limp d**k in my hand,' Sandilands allegedly added.

Five months later, Sandilands and Henderson's partnership came to an abrupt end, after Sandilands accused Henderson of being 'off with the fairies' during a brutal on‑air clash that left her in tears.

Both stars have since launched separate unfair dismissal claims against their former employer, with Sandilands seeking $85million and Henderson $82million.

The eye‑watering figures represent what the pair say they are still owed under their axed contracts, which had been worth about $10million per year each.

CBC's defence paints Sandilands as the architect of a workplace so toxic that Henderson refused to ever work with him again.

The company claims Sandilands' 'destruction of his relationship with Ms Henderson' was the culmination of a 'a persistent course of workplace bullying and harassment of Ms Henderson of which she had complained' - conduct it says amounted to a serious breach of his contract.

The company flatly rejects Sandilands' claim that his sacking was unlawful, as well as Henderson's assertion that she was dismissed for exercising her right to a psychologically safe workplace.

Instead, CBC alleges Sandilands breached multiple internal policies, including the ARN Work, Health and Safety Policy, the ARN Code of Conduct and the Respect in the Workplace Policy.

The February on‑air explosion is also alleged to have breached the NSW Work Health and Safety Act.

CBC further argues it was contracted to employ Henderson as Sandilands' co‑host - not as a standalone presenter - and was under no obligation to offer her an alternative timeslot.

Her refusal to continue working with him, the company claims, constituted a breach of her own contract.

It comes days after claims that Sandilands is set to be back on air in just weeks, according to news.com.au.

'It will all be wrapped up soon. It will end up just sorting itself out, and it will take two to three weeks max,' a source told the outlet.

The source added that Kyle, 'would go back' to his show and has 'no hard feelings' about the headline-making bust-up with Jackie that saw him ousted from his top-rated show. 

However, it's unknown if he will accept less than the $10million-a-year deal he was on before the show's collapse.

A source told the outlet that Sandilands is eager to avoid a drawn-out trial and would consider a 'reasonable' offer from his former employer.

Sandilands and Henderson are expected to appear before Justice Angus Stewart in separate case management hearings on Friday, April 24.

If both attend, it could be the first time they have crossed paths since their now fateful on-air clash on February 20.

The hearings will establish deadlines for both parties to file evidence and may also confirm final trial dates.

Provisional trial dates between 22 and 26 June were reserved for Sandilands' matter when he appeared at his first case management hearing late last month.