A former Stormont minister has said his political career will be over after vowing to "tell the truth" about a green energy controversy linked to his Democratic Unionist leader, First Minister Arlene Foster.
In a remarkable intervention, a tearful Jonathan Bell said he was doing his duty to Northern Ireland by lifting the lid on a furore that has left the taxpayer facing a bill of an estimated £400 million.
He said "documents, emails, times, dates" showed that hundreds of millions of pounds were "abused".
Mrs Foster has faced down calls to resign for her role in the Renewable Heat Incentive (RHI), which was developed during her time as economy minister.
An initiative that was supposed to help businesses mitigate the costs of running eco-friendly boilers actually ended up paying out more than the cost of the fuel - so the more people burned, the more public money they earned. There are claims some applicants to the scheme are in line to pocket £1 million over 20 years for heating empty sheds.
Mr Bell was Mrs Foster's successor as economy minister. He was subsequently replaced in the role after May's Assembly election.
The Strangford MLA referenced his late party leader Dr Ian Paisley when explaining his decision to "tell the truth". He has given an interview to the BBC, which will outline his allegations in full at 10.40pm on Thursday.
"My political career is finished, you are going to be ruined for telling the truth," Mr Bell told the Nolan Show.
"I have had to do one of most of the most difficult things I have had to do in my life... and tell the public of Northern Ireland the truth, to shine a light onto what has occurred and to deal with a major problem.
"People tell me if you step outside the box, if you put your head above the parapet, it will be shot off.
"I believe that God doesn't punish people who tell the truth, so let's see how it plays out. My only aim is that the truth is told, I have now told it."
He said his wife urged him to reveal what he knew about the RHI.
"This is difficult because hospitals in Northern Ireland will not be built," he said.
"There is a ward in the Ulster Hospital (which) is closed. Do you think I can sit back and not tell the truth, not when God has told me to tell the truth?
"Dr Paisley was right - 'tell the truth should the heavens fall on you'.
"So do with me as they will, but the facts are documents, emails, times, dates - you will not find one single thing that is not the truth.
"I have done my duty, I have told the people of Northern Ireland the truth. They elected me to represent them. I did not seek office to close hospitals, I did not seek office to send terminally ill children home while hundreds of millions of pounds are abused."
The RHI aimed to cut the cost of green energy to encourage people to move off fossil fuels, but ended up landing ministers with a massive overspend.
It incentivised the installation of costly eco-friendly heating systems by paying a tariff per kilowatt of heat burned over a 20-year period.
However, unlike in the rest of the UK, in Northern Ireland no cap or payment tier system was placed on the money that could be claimed in proportion to the size of boiler and the hours it was operated.
That resulted in the RHI tariff paid out being higher than the cost of fuel needed to run the boilers.
Thousands signed up to the RHI - a deluge that ultimately forced its closure, but not before Stormont had been left with a huge future bill.
Overall, more than £1 billion of public money will be paid by 2036 to Northern Ireland-based businesses which signed up to the scheme. Around £400 million of that will be paid out by the Stormont Executive.