By eHow Arts & Entertainment Editor
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John Ritter was famous for his work on the TV shows, "Three's Company" and "Three Simple Rules for Dating My Teenage Daughter." He was also the voice of Clifford in the PBS network's animated series, "Clifford the Big Red Dog." He died at the age of 54 in 2003 of an aortic dissection, caused by an undiagnosed congenital heart defect, at the same hospital where he was born.