Chuck Berry Collapses Onstage

The 84-year-old singer was "exhausted," according to his reps.

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At a Chicago concert on Saturday evening, Chuck Berry slumped over his keyboard and had to be escorted offstage after multiple attempts to continue his show. 

"All I know is he felt faint, he felt weak and I was told to call 911," said Michael Petryshyn, the concert's promoter, backstage after Berry's departure.

Berry, who felt ill before the show began, performed two shows on New Year's Eve at New York's B.B. King Blues Club.