Nigel Clough's dream of winning the one domestic trophy which eluded his father, Brian, was shattered as Birmingham defender Liam Ridgewell snatched an injury-time winner to give the Blues a 2-1 win in the FA Cup fifth round tie at Pride Park.
Jay McEveley's 54th minute strike put the Rams on course for a quarter-final spot for the first time in 11 years although Blues keeper Joe Hart will shoulder some of the blame.
But Scott Dann headed home a James McFadden corner to level matters and then Ridgewell popped up with the decider.
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