Gallagher's manager, Craig Marquardo, says the comedian is in stable condition and will be hospitalized overnight. He says he doesn't yet know what caused Gallagher to collapse.
A witness, Chris Blade, told the Rochester Post-Bulletin that Gallagher had complained of pain in his left arm and shortness of breath earlier in the evening. Blade said Gallagher was responsive when emergency crews were taking him out of the club.
Gallagher, whose real name is Leo Anthony Gallagher, is best known for smashing watermelons with a sledgehammer.