Alex Dyer has left his position as Kilmarnock manager after the team lost 3-2 at home to St Johnstone.
Dyer leaves after the side managed just two wins from their last 11 matches.
The club released a statement confirming his departure shortly after the home defeat, where Kilmarnock had been 2-0 ahead but lost three goals in the second half.
The statement read: “We are grateful to Alex for all he has achieved with the club since joining Killie in October 2017. However, recent results and performances have been disappointing and with 24 points from 25 Premiership matches, we believe this is the right time for a change.
“Alex was part of the management team which secured back-to-back club record points totals in 2017/18 and 2018/19 and a return to European football at Rugby Park.
Owner Billy Bowie said: “This was a tough decision for the club and not one which was made lightly. However in light of recent results and in the interest of preserving our Scottish Premiership status, we feel this is the correct time for a change.
“Alex is a great man who I have the utmost respect for and he will always be warmly welcomed back to Rugby Park.
“I want to thank Alex for his important contribution to some truly wonderful days here at Kilmarnock and I wish him every success in the future.
“The club will make no further comment at this time while the Board are fully focused on securing a replacement.”