Veteran funnyman Gallagher has been hospitalised in Texas after suffering a heart attack before a gig.
The 65 year old was walking towards the stage, where he was set to perform, when he collapsed on Wednesday (14Mar12).
His manager tells Tmz.com the comic suffered a "mild to serious" heart attack and will remain in the hospital until the weekend.
Ironically, the comic, real name Leo Anthony Gallagher, Jr., suffered a minor heart attack almost a year ago to the day (10Mar11) during a performance in Rochester, Minnesota, and collapsed onstage.