Police said at least three people were arrested in that clash and two other mass brawls across the city but they could not say who fired the shot that killed the unidentified man.
"One person died in a fight between fans of Corinthians and Palmeiras at around 10:20 this morning," said Sao Paulo police sergeant Andre Aguiar. "We don't know where the shot came from."
Fights between organised fan groups of both sides are common before derbies and Sunday's death was the latest to stem from the battles. Scores of people have died in such fan-related violence over the last two decades.
The game, which Palmeiras won 1-0, kicked off at 4pm as planned with players from both sides taking the pitch side-by-side in a symbolic show of unity.
Dudu headed the winner in the 77th minute when he outjumped Corinthians goalkeeper Cassio two minutes after Palmeiras stopper Fernando Prass saved a penalty from Lucca.
(Writing by Andrew Downie; Editing by Ken Ferris)
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