Music legend Prince, who died Thursday at the age of 57, had been slated to perform at the Fox Theatre in St. Louis April 18 in what would have been a surprise pop-up show.

But he wasn’t feeling well enough to make the date.

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Steve Litman of Steve Litman Presents (and executive producer of Fox concerts) confirmed the St. Louis shows he had been working on last week. Prince would have performed a pair of shows that evening.

Litman said everything was ready to go regarding the concert — artwork, press releases, tickets, etc.

The holdup: Prince had taken ill and didn’t want the shows announced, only to require a cancellation or rescheduled date.

“As you can imagine, on short notice, it was a massive job to get all the pieces in place and keep it as quiet as possible,” Litman said.

Prince performed two shows April 14 at the Fox Theatre in Atlanta; those shows were rescheduled from another date, postponed because he’d fallen ill.