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John Ritter (September 17, 1948 - September 11, 2003) was an American television and movie actor. He was featured in the 1970s television series The Waltons. He performed in several situation comedies on the television, including Three's Company. Ritter was born in Burbank, California and died there on September 11, 2003 of a split artery caused by heart disease. He also did the voice for Clifford the Big Red Dog.