Championship leaders Leicester slump to shock loss at Coventry
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Coventry struck three times in the final 11 minutes plus stoppage time to beat Leicester 3-1 and inflict just the Championship leaders' fourth defeat of the season.
Kiernan Dewsbury-Hall's controversial penalty had given the visitors the lead against the run of play on 44 minutes.
But Leicester were reduced to 10 men in first-half stoppage time when Abdul Fatawu was shown a straight red card.
A first defeat in 11 Championship games means Leicester's cushion in the automatic promotion places could be cut to 10 points by the end of the day should Southampton win at home to Sheffield Wednesday.
Victory maintains Coventry's upward momentum as a nine-game unbeaten run has carried last season's beaten playoff finalists back into the top six.
The home side had enjoyed much the better of the first half but still found themselves behind when Bobby Thomas was penalised for wiping out Dewsbury-Hall after he took the ball.
The Leicester midfielder coolly slotted home the resulting spot-kick.
But the visitors lost their heads moments later when Fatawu, who had earlier been warned to calm down by teammate Wout Faes, cleaned out Jake Bidwell and was instantly shown a red card.
It took Coventry time to make their man advantage count, but Callum O'Hare opened the floodgates when the midfielder curled home from inside the box.
Milan van Ewijk then put the Sky Blues ahead on 88 minutes after Leicester failed to clear a corner.
And O'Hare set the seal on a famous Midlands derby win for the home side in stoppage time when he volleyed home.