The Murray River Council general manager confirmed his retirement would begin at the end of his contract with the council, which is December 31 this year.
As a result, the council will look to start a recruitment process to find a suitable replacement in coming weeks.
Mr Bilske has been with the council since February 2018.
His 22 month contract was designed to accommodate the September 2020 local council election, which have now been delayed due to COVID-19.
The timing would allow the newly elected council three months to recruit a new GM.
The role is the only council staff position decided on by councillors.
At last week’s meeting, council accepted the recommendation to undertake an invited expression of interest for a recruitment consultant to join the selection panel.
The panel will consist Mayor Chris Bilkey, Deputy Mayor Alan Mathers, a recruitment consultant, an independent member and two other councillors.
Nikki Cohen and Geoff Wise were selected to fill those councillor roles.
The panel is responsible for the selection process and will report back with their recommendations. The recruitment report is expected to be tabled at a closed meeting later in the year.