John Ritter
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After falling ill during a rehearsal for his television show, 8 Simple Rules for Dating My Teenage Daughter, John Ritter was taken to the hospital, where he was misdiagnosed with a heart attack. He actually had aortic dissection, which can occur when a tear happens in the aorta, resulting in blood flowing between the walls of the aorta, causing the layers to peel apart. Ritter died during surgery to repair the dissection a few days later.