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In page Karl Swenson:

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Swenson died of a heart attack at Charlotte Hungerford Hospital in Torrington, Connecticut on October 8, 1978,[1] shortly after filming the Little House on the Prairie episode in which his character dies.[2] The episode aired on October 16, 1978, eight days after Swenson's death. Swenson was interred at Center Cemetery in New Milford, Connecticut.[citation needed]