Michael Dunford has resigned from his role as Birmingham chief executive.
Dunford, who has also worked at Derby, Everton and Plymouth, was brought to the club by new owner Carson Yeung following the takeover of the club by the Hong Kong businessman last October.
A club statement read: "Birmingham City can confirm that, after formal discussions with Michael Dunford, the chief executive officer, we have accepted his resignation. We wish him well for the future and thank him for the time spent at the football club."
The club did not reveal the reason for Dunford's exit.
The news follows revelations last week that a court order had been issued demanding that Yeung's company, Birmingham International Holdings, pay £2.2million to investment bank Seymour Pierce for their role in the takeover negotiations.
Club sources confirmed to Press Association Sport earlier this week that they would be prepared to pay the fee, although the club still intend to appeal against the judgment in the hope of recouping the money.
The Yeung regime brought in Dunford as CEO after being impressed by his work in the same role at Everton.
Vice-chairman Peter Pannu told the Birmingham Mail at the time of his appointment: "We were very impressed by his work at Everton and felt that with this club in his hands, we should be very steady while the rest of us can press ahead with our adventurous plans for the future.
"It was absolutely vital for us to secure someone who could bring us that stability and experience, someone who knows football here and the Premier League and has expertise in that field."
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