Norwich will be playing in the third tier of English football for the first time since 1960 after they were humiliated 4-2 at Charlton.
The hosts, already relegated, marked their last match in the Championship in style and they were three goals to the good by the half-hour mark thanks to Nick Bailey's opener and a brace from Deon Burton.
Norwich gave themselves a faint lifeline through Alan Lee in first-half stoppage time but things went from bad to worse minutes after the interval when Burton completed his hat-trick. Sammy Clingan's free-kick reduced the deficit once more but it was too little too late.
The result ensured Barnsley would stay up regardless of their score at Plymouth, but the Tykes triumphed 2-1 to make sure of their Championship status.
Adam Hammill levelled matters after Gary Sawyer's opener and Jamal Campbell-Ryce fired the visitors into the lead shortly after the interval.
Elsewhere, already-relegated Southampton's miserable season continued as they fell to a 3-1 defeat at Nottingham Forest with Luke Chambers, Joe Garner and Robert Earnshaw grabbing the goals for the hosts following Bradley Wright-Phillips' opener.
Roy Keane enjoyed his first home game in charge with his second win in as many games.
Giovani dos Santos and Pablo Counago's first-half goals gave Ipswich a 2-1 win over Coventry, with Clinton Morrison pulling one back late on.
Meanwhile, Blackpool beat Swansea 1-0 thanks to Dudley Campbell's 13th-minute goal and Watford triumphed 3-1 over Derby with a brace from former Rams striker Grzegorz Rasiak and one from Jobi McAnuff in the first-half, before John Eustace's late consolation.
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