Their promotion already in the bag, Frank Lampard's Coventry thrashed Portsmouth 5-1 to go an unassailable 10 points clear at the top with two games to spare.
Millwall went second after winning 3-1 at Stoke and are now three points clear of Ipswich, who have two games in hand and play at Charlton on Wednesday.
It was also a good night for Wrexham, who moved back into the promotion playoff places, ahead of Hull on goal difference, after winning 1-0 at relegation-threatened Oxford thanks to a Josh Windass goal.
Leicester drop down to third tier
Relegated to the second-tier Championship last season, Leicester suffered a humiliating second successive drop after drawing 2-2 at home to promotion-chasing Hull at a King Power Stadium with plenty of empty seats.
Leicester had to beat the Tigers to stave off relegation for at least another day but were already a goal down after 18 minutes when Liam Miller cashed in on an error by goalkeeper Asmir Begovic.
They had the fans dreaming the impossible dream in the second half, though, when Jordan James equalised from the penalty spot in the 52nd and Luke Thomas put them ahead two minutes later. Any joy was short-lived, though, with Oli McBurnie equalising in the 63rd.