Noted Broadway character actor Arnold Soboloff died of a heart attack while waiting in the wings for his second act entrance in Sandy Duncan's Peter Pan. He played Smee.
When searching Google for him, I found this list of deaths that happened onstage at Snopes:
http://www.snopes.com/horrors/freakish/onstage.asp French composer Jean-Baptiste Lully died from an accident that occurred while he was conducting a performance of his music in 1687. Conductors had not yet begun using batons; they stood and and beat time by pounding the stage with long hand-held staffs. Lully wasn't paying attention and stabbed his foot with it. The wound didn't heal well and eventually gangrene set in. His doctors told him that he risked death if they weren't allowed to amputate. He refused, the gangrene spread, and he died.
Updated On: 11/4/14 at 03:53 PM