I have a vague memory of some book or magazine recalling a certain turn-of-the-century opera, musical, or play:
Opening Night- The protagonist points to another member of the troupe and exclaims the line “Oh, God, CRUSH HIM!”…or words to that effect…and that actor pointed to DROPS DEAD for real!
Next night, The Protagonist decides to instead simply point into the audience, one of who suddenly drops dead in his seat.
The third night…really scared of this trend…the protagonist recites the line and points “safely” at the ceiling. Horrifyingly, a set worker manning a spotlight slips and falls to his death.
I don’t know anything about the supposed 3 deaths but The Opera Lover’s Companion by Charles Osborne says of Halévy, “Of the thirty-three operas he completed, a few remained unperformed at his death, while others. among them *Clari *(1828), La Reine de Chyphre (1841) and Charles VI (1843), were successful in their day.”
So it sounds like it at least ran longer than 3 performances.
Actually another of his operas was associated with two famous deaths.
The role of Éléazar was the last thing Caruso ever sang in public. A few hours after appearing in “La Juive” at the Met he doubled over screaming due to pleurisy. He died seven months later.
A few decades on, Richard Tucker urged the Met to mount the opera for him. One week after the Met finally relented, Tucker died of a heart attack. Tucker’s on stage funeral at the Met was only the second ever permitted. The first was of course Caruso.