Harry Redknapp has been sacked as Birmingham manager after just 13 games in charge.
The 70-year-old former Tottenham boss was brought in on a rescue mission at the end of last season and succeeded in keeping Blues in the Championship.
But a torrid start to this campaign has seen them win just two of their 10 games in all competitions and the club's board made their move in the wake of a 3-1 home defeat to Preston.
A statement from City read: "Blues have parted company with manager Harry Redknapp."
The former QPR boss signed 14 players in the summer, including Jota, Harlee Dean and Maxime Colin from Brentford, but that didn't stop the Blues from slumping to a sixth straight defeat to the Lilywhites.
Former Brentford head coach Lee Carsley will take charge on a caretaker basis, while the Blues search for a replacement.