Ex-England coach Steve McClaren has resigned as Nottingham Forest manager after just 10 games in charge of the struggling Championship side, the former European champions confirmed on Sunday.
McClaren walked out just hours after Forest fans called for him to quit following Birmingham's 3-1 win at the City Ground.
"Nottingham Forest can confirm that Steve McClaren has resigned from his role as manager," a club statement said.
"McClaren informed chairman Nigel Doughty of his decision after today's 3-1 home defeat by Birmingham. He has left the club without compensation, nor will he be seeking any.
"Mr Doughty has also announced his intention to step down as chairman. The search for a new manager will begin immediately."
McClaren, the former Wolfsburg, FC Twente and Middlesbrough boss, was already under pressure following Forest's woeful start to the season and he leaves with the team languishing just one point and one place above the relegation zone in English football's second tier.
McClaren had already been forced to deny rumours he was considering his future after Forest failed to back him in the transfer market before the window shut on August 31.
And, with Tuesday's 5-1 thrashing at Burnley still fresh in the memory, McClaren desperately needed a victory to buy him some breathing space.
It looked like he might get it when Ishmael Miller put the hosts ahead in the 35th minute.
But Birmingham pushed McClaren to the brink as Chris Burke equalised in the 75th minute before New Zealand forward Chris Wood struck in the 79th and 88th minutes to leave Forest still waiting for their first home win this season.