(CNN) -- The comic Gallagher, known for smashing watermelons, is "slowly recovering" from a heart attack suffered just before he was to perform at a Texas club, his promotional manager said Thursday.
"We will not know the outcome until sometime tomorrow," Christine Scherrer said.
Gallagher, 65, is in stable condition at an undisclosed Dallas-area hospital, Scherrer said.
He was about to go onstage Wednesday at Hat Tricks, a Lewisville, Texas, club, when he fell ill and was taken to a hospital by paramedics, she said.
"His family is with him and Hat Tricks has been unbelievable with the help and support with everything," Scherrer said.
His shows in Texas, Oklahoma and Oregon scheduled through next week have been postponed, she said.
CNN's Jane Caffrey contributed to this report.