Conservative AM Darren Millar has revealed that former minister Carl Sargeant asked him to question the First Minister about bullying in the Welsh Government in 2014.
Mr Millar told the Senedd that after much soul-searching he felt a moral obligation to speak out.
He said he had based his questions on hand-written drafts provided by the late Carl Sargeant and tabled them once the former minister had told him that a complaint about bullying had been made.
Mr Millar said he would not name the individual identified by Carl Sargeant but that there was no accusation of bullying against the First Minister himself.
Carwyn Jones has agreed to an independent investigation into whether he broke the ministerial case when he denied in his answers to Mr Millar that he knew of any allegations of bullying.
Mr Sargeant was found dead last month. He apparently took his own life after being sacked from the Welsh Government following allegations of inappropriate conduct towards three women.
Darren Millar added in his statement to AMs that Carl Sargeant was a loyal member of the Welsh Government and a loyal member of the Labour Party, who took his Cabinet duties and collective responsibility seriously. Mr Millar said that it was out of his loyalty to the Welsh Government and the party that he loved that he wanted the issues to be addressed.
A Welsh Government source has said Darren Millar's statement will not affect its position on how the First Minister responded to the questions about bullying allegations, as Carwyn Jones has already referred himself to the independent investigator James Hamilton. Mr Millar said he wants his statement to be considered as evidence by Mr Hamilton's inquiry.