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Comedian Jerry Lewis is no longer serving as the Muscular Dystrophy Association's national chairman and won't be appearing on this year's Labor Day telethon, the nonprofit agency announced Wednesday night.

Lewis, 85, has been the MDA's national chairman since the early 1950s and has hosted the Labor Day Muscular Dystrophy Association telethon since 1966.

He announced in May that he was retiring as host of the telethon that has become synonymous with his name. But Lewis added that he planned to make his final appearance on this year's Sept. 4, show and planned on continuing to serve as MDA's national chairman.

MDA Chairman of the Board R. Rodney Howell said in a statement that Lewis "will not be appearing on the telethon" and "we will not be replacing him as MDA national chairman."

Howell added that Lewis "is a world-class humanitarian and we're forever grateful to him for his more than half century of generous service to MDA."

The statement did not provide any further explanation for the moves, and calls to the Tucson, Ariz,-based nonprofit weren't immediately returned Wednesday night. Representatives for Lewis, a publicist and a manager, also did not immediately respond to messages left for comment.

Lewis, a Las Vegas resident, has in recent years battled a debilitating back condition, heart issues and the crippling lung disease pulmonary fibrosis.

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