Carwyn Jones has asked the Welsh Government's top official to begin setting up an independent inquiry to examine his handling of the Carl Sargeant case.
A spokesman for the First Minister said Mr Jones believes a senior QC should carry out work to examine his 'actions and decisions' in relation to the former assembly member, who was found dead on Tuesday.
Mr Sargeant, 49, is understood to have taken his own life four days after being removed from his role as cabinet secretary for communities and children and suspended from the Labour party over allegations of 'unwanted attention, inappropriate touching or groping'.
Mr Jones had been under mounting pressure to launch an independent inquiry, with Mr Sargeant's family adding to the criticism shortly before the First Minister's announcement.
Mr Sargeant's family said there had been 'serious failings' in the way the situation was handled.